Two sapphire-fronted automatic divers from the same maker, at nearly the same money. One tells you which movement you are buying and is 2mm thinner. The other is rated 30m deeper.
Buy the Fleuss. Spinnaker names its caliber — a Miyota 8215, 42 hours, the most widely serviced automatic in the world — and the case is 13mm thick against the Bradner's 15mm, at the cost of 30m of water resistance you will never use. Buy the Bradner only if you want the 18 ATM rating specifically and 15mm on the wrist does not bother you.
Spinnaker is the microbrand you are most likely to meet on Amazon, and these are its two automatic divers at similar money. They look like variations on one watch and in most respects they are: sapphire, a screw-lock crown, a stated two-year international warranty, and no published figure for what an overhaul costs.
Two things separate them, and only one of them is on the marketing copy. The Bradner is rated 180m against the Fleuss's 150m, which is the number Spinnaker leads with. The Fleuss names its movement and is 2mm thinner, which is the pair of facts that should actually decide it.
This site scores watches on six specifications, and two of them — movement serviceability and published service price — are about what a watch costs you in year eight rather than week one. On those, naming the caliber is worth more than 30m of a rating that neither watch is certified to use.
On prices: every buy button on this page reads its figure from the live price layer and stamps the date it was checked, or else reads "Check price on Amazon". No price is written into this text. Service figures quoted here are the manufacturers' own published rates.
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.
01Does it name the movement
The Fleuss product page states a Miyota 8215. The Bradner's says "Japanese automatic" and nothing more. That is the difference between a known service path and a guess.
02Thickness
13mm against 15mm. On a diver that is the difference between sitting under a cuff and not.
03Water resistance
150m against 180m. Neither carries a diver's certification; both have a screw-lock crown.
04Fit
51mm against 50mm of published lug-to-lug. Both are large, and both makers publish the number.
05What is identical
Sapphire, 316L or stainless steel, a stated two-year international warranty, no published service price, and both on Amazon.
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.
#
Watch
Best for
Keep Score
Price
1
Spinnaker Fleuss Automatic SP-5055
Named Miyota 8215, 42 hours, sapphire, 150m, 13mm thick.
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.
Spinnaker names the caliber: a Miyota 8215, 21 jewels, 21,600 vph, 42 hours of reserve. That is the most widely serviced automatic in the world — every independent watchmaker has had one apart — so a service is a known job rather than an unknown one.
13mm thick on a 43mm case, with sapphire, a screw-down crown and 15 ATM. 2mm thinner than the Bradner is the single most noticeable difference on the wrist.
The lug-to-lug is 51mm, the longest published number on this site. The 8215 also does not hack — the seconds hand keeps running when you pull the crown — which is a real irritation if you set your watches against a reference.
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
180m against 150m, with sapphire and a screw-lock crown, and the same stated two-year international warranty. If the depth figure is what you are buying, this is the one with the bigger number.
Spinnaker does not say which movement is inside. "Japanese automatic, three hands with date" could be several calibers, and without the name you cannot look up parts availability or what a rebuild involves.
15mm thick is the other cost. That is thicker than the 45mm Seiko Turtle and thicker than every other watch on this comparison, on a 42mm case with a 50mm lug-to-lug. It is a lot of watch in both directions.
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
Movement
Japanese automatic, three hands with date
Power reserve
Not published
Case
42mm stainless steel
Lug-to-lug
50mm
Thickness
15mm
Lug width
20mm
Crystal
sapphire
Water resistance
180m
Warranty
2 years
Spinnaker states a two-year international warranty on this product page.
It fails this page because it is not a Spinnaker. We list it because if you are shopping this tier at all, you should see it: sapphire, 200m, a screw-down crown and an in-house automatic that hacks and hand-winds, at similar money to both Spinnakers.
12.8mm thick with a 46.8mm lug-to-lug, so it is thinner than the Fleuss and over 4mm shorter across the lugs than either Spinnaker. Orient also states a three-year warranty against Spinnaker's two.
Orient publishes no service price either, so on that axis nothing here is better. Our microbrand dive watches page sets the Spinnakers against this watch properly.
On paper this is the best value in the category and it is not close: sapphire and a hacking, hand-windable in-house caliber at a price where Seiko still fits Hardlex. Orient's three-year warranty is longer than Hamilton's or Tissot's.
Manufacturer specifications for the Orient Kamasu RA-AA0004E39B
Read from Spinnaker's own product pages for SP-5055-0E and SP-5062-33.
Fleuss Automatic SP-5055
Bradner SP-5062-33
Movement
Miyota 8215, 21 jewels, 21,600 vph
"Japanese automatic" — not named
Power reserve
42 hours
Not published
Case
43mm, 13mm thick
42mm, 15mm thick
Lug-to-lug
51mm
50mm
Lug width
22mm
20mm
Case material
316L stainless steel
Stainless steel
Crystal
Sapphire
Sapphire
Water resistance
150m, screw-down crown
180m, screw-lock crown
Warranty
2 years, stated
2 years international, stated
Published service price
None
None
Read from Spinnaker's own product pages for SP-5055-0E and SP-5062-33.
Why the named caliber is the whole argument
A movement name is not trivia. It tells you whether parts exist, whether an independent watchmaker has seen one, and roughly what a rebuild involves. The Miyota 8215 is about as safe an answer as there is: Citizen-owned Miyota has built it for decades, it is in thousands of watches, and the 21,600 vph architecture is simple to work on.
"Japanese automatic" tells you none of that. It is probably also a Miyota or a Seiko Instruments caliber, and it is probably fine. But on a site whose rule is that an unsourced fact does not get published, "probably" is the problem — we cannot print a power reserve for the Bradner because Spinnaker does not state one.
Our Miyota versus Seiko NH movements page covers both families, and makes the same point: which one you get matters less than whether the brand tells you.
180m versus 150m, honestly
Neither watch carries a diver's certification. The marking that means something — the ISO 6425 regime, which Seiko prints as "Diver's 200m" — involves tested resistance to pressure, salt water, shock, magnetism and thermal shock. Both of these are pressure ratings and nothing else.
For swimming, showering and anything short of scuba, both are comfortably over-specified and the screw-down crown matters more than the number. 30m of difference between two uncertified watches is not a reason to carry 2mm more thickness every day. Our water resistance guide explains what each rating actually permits, and are dive watches worth it covers what certification buys.
Both of them are big
51mm and 50mm of lug-to-lug are the two longest figures on this site. For context, the Seiko Turtle — a watch nobody calls small — is 45mm across with a cushion case, and the Orient Kamasu is 46.8mm lug to lug.
If your wrist is under about 175mm, both of these will overhang. That is worth knowing before the crystal or the caliber comes into it, and it is the reason both appear on our dive watches for large wrists page rather than the small-wrist one.
Which to buy
The Fleuss, on the two things that will still matter in ten years: you know what is inside it, and it is 2mm thinner. The 18 ATM on the Bradner is a number for the box, not for your week.
And if what you actually want is the best diver at this money rather than the best Spinnaker, read best dive watches under $500 first — the Orient Kamasu is thinner than both, rated 200m, hacks, and carries a three-year warranty.
Questions people actually ask
Which Spinnaker diver should I buy, the Fleuss or the Bradner?+
The Fleuss. It names its movement — a Miyota 8215 with 42 hours of reserve — and it is 13mm thick against the Bradner's 15mm. The Bradner's only advantage is a 180m rating against 150m, on a watch neither certified for diving.
What movement is in the Spinnaker Bradner?+
Spinnaker does not say. The product page states only "Japanese automatic, three hands with date", and publishes no power reserve. That is the main reason we recommend the Fleuss instead.
Does the Miyota 8215 hack?+
No. The seconds hand keeps running when you pull the crown, so you cannot set it precisely against a reference. If hacking matters to you, the Orient Kamasu's in-house F6922 does it and so does every Seiko 4R.
Are either of these real dive watches?+
Both have a screw-down crown and a pressure rating well beyond swimming, but neither carries a diver's certification. For a watch with the ISO marking, the Seiko Prospex Turtle is the cheapest route.
How big are they on the wrist?+
Large. The Fleuss is 43mm with a 51mm lug-to-lug and the Bradner is 42mm with 50mm — the two longest published lug-to-lug figures on this site. Measure your wrist before choosing either.
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.
