Astor + Banks Sea Ranger M2vsSeiko Prospex Marinemaster 1968 Heritage Diver's Watch
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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.

Sea Ranger M2

Prospex Marinemaster 1968 Heritage Diver's Watch
Diameter
40mm
42.6mm
Lug-to-Lug
45.5mm
lowest
49.3mm
Thickness
12.5mm
lowest
14.1mm
Water Resistance
300m
300m
Power Reserve
n/a
72h
MSRP
$1,299
lowest
$3,600
Movement
La Joux-Perret G100
Seiko 8L45
Case
4 specsCrystal & Dial
4 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Astor + Banks Sea Ranger M2 is noted for its functional and balanced design, excellent legibility, and a 12-hour lumed sapphire bezel. Reviewers highlight its good lume, though one source describes it as good but not great. The watch features a 40mm case and 300m water resistance. One review states it uses a La Joux-Perret G100 movement regulated to ±8 seconds per day, while another mentions a Sellita SW200 automatic movement adjusted by the brand. The pre-order price is $650, with a standard price of $850. On balance, reviewers find the Astor + Banks Sea Ranger M2 to be a compelling GADA watch, with its design and legibility being key strengths.
Owners and reviewers widely praise the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch for its exceptional finishing, comparable to Grand Seiko, and refined design, with particular appreciation for its case shape and the 4:00 crown position. The watch is noted for its enjoyable look and feel, and some consider it a significant step up from standard Prospex models, offering premium finishing and a tool-like appearance. The movement Seiko 8L45 is mentioned, along with a 72-hour power reserve and an accuracy of -5/+10 seconds per day. However, some find the price point high, and one reviewer noted the unsigned winding crown as a missed opportunity for a watch in this price range. On balance, owners and reviewers rate the Seiko Prospex Marinemaster Marinemaster 1968 Heritage Diver's Watch highly for its exceptional finishing and refined design at its price point.
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