Seiko Prospex Marinemaster 1968 Heritage Diver's WatchvsFormex Reef 42 mm

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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.

Seiko Prospex Marinemaster 1968 Heritage Diver's Watch at true scale

Prospex Marinemaster 1968 Heritage Diver's Watch

Formex Reef 42 mm at true scale

Reef 42 mm

Diameter

42.6mm

42mm

Lug-to-Lug

49.3mm

47mm

lowest

Thickness

14.1mm

11.4mm

lowest

Water Resistance

300m

300m

Power Reserve

72h

highest

56h

MSRP

$3,600

$2,414

lowest

Movement

Seiko 8L45

Sellita SW300-1

Case

4 specs
Diameter
42.6mm
42mm
Thickness
14.1mm
11.4mm
Lug-to-Lug
49.3mm
47mm
Lug Width
20mm
22mm

Crystal & Dial

4 specs
Crystal Shape
Curved
n/a
AR Coating
Anti-reflective coating on inner surface
n/a
Dial Color
n/a
Black
Lume
LumiBrite on hands, index(es) and bezel
Super-LumiNova

Movement

3 specs
Caliber
Seiko 8L45
Sellita SW300-1
Power Reserve
72h
56h
Jewels
35
0

Pricing

1 specs
MSRP
$3,600
$2,414
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seiko Prospex Marinemaster 1968 Heritage Diver's Watch

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.

Formex Reef 42 mm

Owners widely praise the Formex Reef 42 mm for its comfortable bracelet with a micro-adjust clasp and its overall build and finish, with one owner strongly recommending it. Reviewers highlight its impressive wearability and versatility, noting the COSC-certified Sellita SW300-1 movement and well-finished bracelet. One owner found the lugs' taper hinders third-party strap fit and observed the seconds hand does not perfectly align with markers. On balance, owners and reviewers rate the Formex Reef 42 mm highly for its comfortable bracelet and solid build at its price point.