Alexander James Watches A4 Prelude 37 GMTvsSan Martin BB GMT

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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

A4 Prelude 37 GMT

BB GMT
Diameter
37.4mm
39mm
Lug-to-Lug
44.7mm
n/a
Thickness
12.1mm
n/a
Water Resistance
200m
highest
100m
MSRP
n/a
$269
Movement
Seiko NH34
Seiko NH34
Case
5 specsCrystal & Dial
2 specsMovement
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the Alexander James Watches A4 Prelude 37 GMT's imitation snowflake dials, calling them some of the best available outside of Grand Seiko. The watch features a Seiko NH34 automatic movement, 200m water resistance, and a 37.4mm case, with color options available around $280. One owner notes that its use of the same internals and a modded SKX013 case design makes it difficult to justify the price over a Seiko GMT. Overall, owners find the dial design to be the standout feature, though some question the value proposition compared to Seiko alternatives.
Owners are broadly enthusiastic about the San Martin BB GMT. One calls the design a handsome mashup of the Black Bay Pro and Explorer 2 that looks rugged yet can be dressed up, and another, after a couple of weeks of wear, says it wears much like a Tudor BB58. Praise for finishing is specific: one owner was struck by the polishing and craftsmanship straight out of the box, while another calls it a steal at €260 for a 20 ATM watch with sapphire crystal, anti-reflective coating, a Seiko GMT movement, and an on-the-fly adjustable clasp. Some owners dislike the clasp as big and clunky, and one reports that screw-down crown threads wouldn't seat and that the brand refused a return until AliExpress refunded him. A few note that later pieces are pricier and often need regulation. Overall, owners rate the San Martin BB GMT highly for its value and finishing, with build consistency and the clasp as the main reservations.
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