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Miyota vs Seiko NH

Miyota vs Seiko NH movements

Almost every microbrand automatic runs one of two movement families. Both are good. What matters more is whether the brand tells you which one you are buying.

By Sawyer V. · Published

The short answer

Neither is the risk. Miyota's 8215 and 9039 and Seiko Instruments' NH series are current production, have a stop-second device and are serviceable by any independent. The 9039 is the refined one — 28,800 vph, 3.90mm tall, -10/+30 seconds a day. The 8215 and NH series are the workhorses at 21,600 vph.

Open almost any affordable microbrand automatic and you will find one of two things: a Miyota, made by the Citizen group, or an NH-series caliber sold by Seiko Instruments through Time Module. Both are made in huge volume, both are stocked by parts suppliers that have nothing to do with the brand on the dial, and both can be serviced by any independent watchmaker. That is the strongest argument for microbrand watches, and it holds.

We read every figure below from the movement makers' own pages rather than from the enthusiast sites that rank for this query — and it mattered. Several of those sites say the Miyota 8215 has no stop-second device. Miyota's own specification for the 8215 lists one.

The calibers, from the makers' own specifications

Miyota figures from miyotamovement.com product pages; NH3 figures from Time Module's NH series line-up. Where a maker does not state a figure, we say so rather than borrowing one.
Miyota 8215Miyota 9039Miyota 82S0SII / TMI NH3 family
Beat rate21,600 vph28,800 vph21,600 vph21,600 vph
Jewels21242124
Height5.67mm3.90mm5.67mm5.32mm
ReserveAbout 42 hoursAbout 42 hoursAbout 42 hoursNot stated on TMI's line-up page
Accuracy-20/+40 sec/day-10/+30 sec/day-20/+40 sec/dayNot stated on TMI's line-up page
Stop-secondYesYesYesYes
Hand-windingYesYesYesNot stated on TMI's line-up page
DateYesNo — three handsNo — open heartNH35 date; NH36 day-date; NH34 GMT
Found inSpinnaker FleussBaltic AquascapheLaco Augsburg (as the Laco 2S)BOLDR Venture (NH38A)
Miyota figures from miyotamovement.com product pages; NH3 figures from Time Module's NH series line-up. Where a maker does not state a figure, we say so rather than borrowing one.

On prices: we publish no figure we have not verified today, so every buy button reads "Check price on Amazon" — and where a brand sells direct, the link earns us nothing and says so.

How we picked

We have not worn these watches. What follows is what we checked instead, on documents you can open yourself — the same criteria, in the same order, on every roundup on this site. The full method is on the methodology page.

  1. 01Beat rate

    21,600 vph on the Miyota 82 series and the NH3 family; 28,800 on the Miyota 9039. Faster is smoother and, in principle, steadier.

  2. 02Height

    3.90mm for the 9039, 5.32mm for the NH3 family, 5.67mm for the 8215. Movement height sets the floor for case thickness.

  3. 03Accuracy

    Miyota publishes -20/+40 sec/day for the 8215 and -10/+30 for the 9039. Time Module's line-up page does not state a figure for the NH3 family.

  4. 04Stop-second and hand-winding

    Stop-second is listed by Miyota on the 8215, 9039 and 82S0, and by Time Module across the NH3 family. Hand-winding is listed by Miyota; Time Module's line-up page does not mention it.

  5. 05Disclosure

    Whether the watch brand names the caliber at all. This is the one that separates microbrands.

Disclosure · Some links below are Amazon affiliate links. If you buy through one we earn a commission at no extra cost to you. It does not decide what goes on this page or in what order — here is exactly how that works.

Quick picks

Ranked on the Keep Score below — six published specifications, weighted identically on every page. The last row is the one we would not buy.

#WatchBest forKeep ScorePrice
1

Spinnaker Fleuss Automatic SP-5055

A named 8215, sapphire, 15 ATM and a stated two-year warranty.

The Miyota 8215 in a watch that tells you so8.0/10
Check price
2

Baltic Aquascaphe Classic

28,800 vph, 3.90mm tall, -10/+30 seconds a day — in a 39mm diver.

The Miyota 9039, the refined option7.7/10
Direct only
3

BOLDR Venture Titanium 38mm

NH38A, 38mm titanium, 44mm lug-to-lug, 200m.

The Seiko Instruments NH family, in titanium7.7/10
Direct only
4

Laco Augsburg 39

A Laco 2S built on the Miyota 82S0, with hacking seconds and sapphire both sides.

The Miyota 82S0, finished and renamed6.8/10
Direct only
—

Spinnaker Bradner SP-5062-33

"Japanese automatic, three hands with date" — the caliber is not named.

Skip this one

Nothing, on a page about knowing your movement8.0/10
Check price

Keep Score is arithmetic, not opinion — six published specifications, weighted the same way on every page. The formula is on our methodology page, so you can re-run it yourself.

01

Spinnaker Fleuss Automatic SP-5055

Best for: The Miyota 8215 in a watch that tells you so

8.0/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
1.1/1.5
Warranty
0.7/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Check price on Amazon

#ad Affiliate link · We publish no price we have not verified today

Spinnaker names the Miyota 8215 on the Fleuss product page, which is the whole point of this page: you can look the caliber up, confirm its stop-second device and 42-hour reserve on Miyota's own site, and know any independent can service it.

Sapphire, a screw-down crown and 15 ATM, with a stated two-year international warranty. The 51mm lug-to-lug is the thing to check before buying — it is the longest on this site.

Sapphire, 15 ATM, a screw-down crown and a stated two-year warranty on a Miyota 8215 — a caliber every independent has seen. Then Spinnaker publishes the lug-to-lug: 51mm, the longest on this site by a clear margin.

Manufacturer specifications for the Spinnaker Fleuss Automatic SP-5055
MovementMiyota 8215, automatic, 21 jewels, 21,600 vph
Power reserve42 hours
Case43mm 316l stainless steel
Lug-to-lug51mm
Thickness13mm
Lug width22mm
Crystalsapphire
Water resistance150m
Warranty2 years

Specifications read from Spinnaker product page, SP-5055-0E.

02

Baltic Aquascaphe Classic

Best for: The Miyota 9039, the refined option

7.7/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
1.5/1.5
Warranty
0/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Sold direct by Baltic

We earn nothing on this link. Baltic sells it directly.

The 9039 is the premium Miyota: a faster 28,800 vph beat, a tighter published tolerance, and a 3.90mm height that lets Baltic build a 200m diver without a date window and without excess thickness.

Sapphire crystal and a sapphire bezel insert, 47mm lug-to-lug. Baltic states no warranty term and sells direct — we earn nothing on this link.

The sapphire bezel insert is the part that matters for keeping: aluminum inserts fade and ceramic chips, and this does neither. Baltic sells direct, so there is no buy button here from us.

Manufacturer specifications for the Baltic Aquascaphe Classic
MovementMiyota 9039 automatic
Power reserve42 hours
Case39mm 316l stainless steel
Lug-to-lug47mm
Thickness13mm
Lug width20mm
Crystalsapphire
Water resistance200m
WarrantyNot stated by the manufacturer

Baltic does not state a warranty term on this product page.

Specifications read from Baltic Watches product page, Aquascaphe Classic.

03

BOLDR Venture Titanium 38mm

Best for: The Seiko Instruments NH family, in titanium

7.7/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
1.5/1.5
Warranty
0/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Sold direct by BOLDR

We earn nothing on this link. BOLDR sells it directly.

BOLDR names the NH38A — the no-date member of the NH family — which puts the Venture on the most widely serviced microbrand caliber after Seiko's own 4R. Time Module lists the family at 21,600 vph with 24 jewels and a stop-second device.

A 38mm titanium case rated to 200m, sapphire, 44mm lug-to-lug. BOLDR states no warranty term and sells direct.

The NH38A is the movement every independent watchmaker already knows, which is the whole serviceability argument in one line. A 44mm lug-to-lug on a 38mm case is about as wearable as a 200m watch gets.

Manufacturer specifications for the BOLDR Venture Titanium 38mm
MovementSeiko Instruments NH38A automatic
Power reserveNot published
Case38mm titanium
Lug-to-lug44mm
Thickness12mm
Lug width20mm
Crystalsapphire
Water resistance200m
WarrantyNot stated by the manufacturer

BOLDR does not state a warranty term on this product page.

Specifications read from BOLDR Supply Co. product page, Venture.

04

Laco Augsburg 39

Best for: The Miyota 82S0, finished and renamed

6.8/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
0.6/1.5
Warranty
0/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Sold direct by Laco

We earn nothing on this link. Laco sells it directly.

Laco is not a microbrand — it supplied observation watches in the 1940s — but it is the clearest example of a respected maker building on a Miyota base and saying so. The Laco 2S is a finished Miyota 82S0, a caliber Miyota lists with an open-heart variant and a stop-second device.

Sapphire front and back, 39mm at 46.5mm lug-to-lug, 5 ATM. Laco states no warranty term on the product page and sells direct.

Sapphire front and back, 46.5mm lug-to-lug and a Miyota base any independent can service. Laco states no warranty term on the product page and 5 ATM is the weak line — this is a dry-land watch.

Manufacturer specifications for the Laco Augsburg 39
MovementLaco 2S automatic, based on the Miyota 82S0, hacking seconds
Power reserveNot published
Case39mm matt finished stainless steel
Lug-to-lug46.5mm
Thickness11.55mm
Lug width18mm
Crystalsapphire
Water resistance50m
WarrantyNot stated by the manufacturer

Specifications read from Laco Watches product page, Augsburg 39 (861988).

Skip this one

Spinnaker Bradner SP-5062-33

Best for: Nothing, on a page about knowing your movement

8.0/10

Keep Score

Crystal
2.5/2.5
Serviceability
2.5/2.5
Water resistance
1.1/1.5
Warranty
0.7/1.5
Strap standard
1/1
Cost-to-keep transparency
0.2/1
Check price on Amazon

#ad Affiliate link · We publish no price we have not verified today

The Bradner is a good dive watch on paper — sapphire, 18 ATM, a screw-lock crown and a stated two-year warranty — and it scores well on this site.

Spinnaker describes the movement only as a "Japanese automatic, three hands with date". It is almost certainly one of the two families above, but "almost certainly" is not what you want when a watchmaker asks what is inside. On a page whose whole argument is that a named caliber is what makes a microbrand safe to buy, this is the one we would not.

The [Fleuss above](/microbrands/best-automatic-watches) is the same brand with the caliber named.

Sapphire and a stated two-year warranty at this price is a good trade. 15mm thick and 50mm across the lugs is not — this is a big watch, and the spec sheet says so plainly.

Manufacturer specifications for the Spinnaker Bradner SP-5062-33
MovementJapanese automatic, three hands with date
Power reserveNot published
Case42mm stainless steel
Lug-to-lug50mm
Thickness15mm
Lug width20mm
Crystalsapphire
Water resistance180m
Warranty2 years

Spinnaker states a two-year international warranty on this product page.

Specifications read from Spinnaker product page, SP-5062-33.

Which movement to prefer

  • The 9039 if you can choose it. Faster beat, tighter published tolerance, thinner — and no date, which some buyers see as a feature.
  • The 8215 or the NH family for the workhorse. Both are current production at 21,600 vph, both stop the seconds for setting, and parts for both are everywhere.
  • Whichever the brand names. A named caliber can be looked up, priced and serviced by anyone. An unnamed one is a question you will have to ask later.

The comparison that matters more

The movement is the least risky part of a microbrand watch. The exposure is everything the brand made itself — the bezel insert, the crown tube, the bracelet end links — which is covered on best microbrand automatic watches and are microbrand watches worth it.

Questions people actually ask

Is Miyota better than Seiko NH35?

Not categorically. The Miyota 9039 is the refined option, at 28,800 vph and a published -10/+30 seconds a day. The Miyota 8215 and the NH35 are comparable workhorses at 21,600 vph; both stop the seconds for setting and both are serviceable anywhere.

Does the Miyota 8215 hack?

Miyota's own specification for the 8215 lists a stop-second device, along with automatic and hand winding and about 42 hours of reserve. Several third-party sites say otherwise; we go by the maker's page.

Are microbrand movements reliable?

Yes. Miyota and Seiko Instruments calibers are current production, made in huge volume and stocked by parts suppliers that have nothing to do with the watch brand — which is why the movement is the least risky part of a microbrand watch.

What is the difference between the NH35 and NH38?

Time Module lists the NH3 family as sharing 21,600 vph, 24 jewels and a stop-second device. The NH35 has a date; the NH38, used in the BOLDR Venture, is the no-date three-hand version.

Sources

Every specification and figure on this page came from one of these documents. Where a manufacturer does not publish something, the page says so rather than filling the gap.

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