Best antimagnetic watches

The H-10 with a Nivachron balance spring and 80 hours of reserve, behind sapphire and rated 100m, in a 38mm case with a 47mm lug-to-lug.

Two years of warranty and no US service price list.

Mechanically identical to the Murph and usually cheaper, because it does not carry a film's name. 47mm lug-to-lug on a 38mm case is a genuinely versatile footprint.

Mechanically the Khaki Field Auto, with the Murph's dial and a folding clasp.

Hamilton does not publish its lug-to-lug.

Hamilton fits Nivachron across the Khaki Field line — an antimagnetic hairspring, addressing the failure mode that used to send affordable mechanicals to the bench. This is a watch designed around the twenty-year case.

The same Nivachron H-10 in a 42mm titanium case — light for its size.

The black PVD coating will wear at the edges.

Titanium plus PVD is the combination to think hardest about: the metal underneath is light and hypoallergenic, but a coating is a consumable — once it wears through at the lug edges, it is a refinish, not a polish.

The H-40 with Nivachron and 80 hours, with day and date, behind sapphire and rated 100m.

42mm, and Hamilton does not publish the lug-to-lug.

Hamilton fits the same Nivachron hairspring here as on the Khaki Field line, and the H-40 runs 80 hours. Sapphire and 100m on a watch this legible is the pilot-watch specification sheet most of the category never manages.

Tissot states a Nivachron balance spring for the Gentleman, with 80 hours, sapphire and 100m, and publishes a $210 US service price.

An open heart, and a 21mm lug width.

The quick-release bracelet is the detail worth paying for: this is one of the few Swiss automatics at this level you can re-strap in thirty seconds without a tool.

A hand-wound H-50 with Nivachron in a 9.5mm case — the thinnest antimagnetic watch here.

Rated 50m.

No rotor means fewer parts and a thinner case, and the H-50 runs 80 hours on a wind. This is the simplest genuinely good mechanical watch on this site, and simple is what survives.

Nivachron with an 80-hour Powermatic 80 inside a 9.75mm dress case, under sapphire.

30m — keep it out of the shower.

Under 10mm thick with 80 hours of reserve is the combination that makes a dress watch practical — put it down on Friday and it is still running Monday. 30m means keep it off in the shower.