Side by side

Orient RA-AC0K Diver WatchvsSeiko Prospex Sea 1968 Heritage Diver's GMT

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

What people say

Owners + reviewers, side by side

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

Orient RA-AC0K Diver Watch

Owners widely praise the Orient RA-AC0K Diver Watch for exceeding expectations and being a "real" watch. The mechanical movement is noted for keeping great time, running within a handful of seconds fast per day, with some owners considering Orient's budget movements among the best for accuracy. Overall, owners rate the Orient RA-AC0K Diver Watch highly for its surprising quality and reliable timekeeping at its price point.

Seiko Prospex Sea 1968 Heritage Diver's GMT

The Seiko Prospex Sea 1968 Heritage Diver's GMT is widely praised for its build quality, finishing, and comfortable wearability, offering good value for its price point. Owners and reviewers highlight the attractive silver/white sunray dial, blue ceramic bezel, and the premium feel of the improved bracelet clasp with excellent micro-adjustment. The Caliber 6R54 movement provides a 72-hour power reserve, and real-world accuracy often exceeds its stated range of +25 to -15 seconds per day, with some owners reporting figures around +3 to +5 seconds per day. However, the caller-style GMT functionality is a point of contention for some, who find the GMT scale difficult to read and prefer a flyer GMT at this price. Some also find the crown position at 4 o'clock undesirable, and a few note a lack of dial contrast or illegibility of the inner bezel.

At a glance

15 of 29 specs differ
Diameter
RA-AC0K Diver Watch43.4mm
Prospex Sea 1968 Heritage Diver's GMT42mm
Power Reserve
RA-AC0K Diver Watch40h
Prospex Sea 1968 Heritage Diver's GMT72h
Water Resistance
RA-AC0K Diver Watch200m
Prospex Sea 1968 Heritage Diver's GMT200m
MSRP
RA-AC0K Diver Watch$455
Prospex Sea 1968 Heritage Diver's GMT$1,500

Full specifications

Case

4 specs
Diameter
43.4mm
42mm
Thickness
12.8mm
12.9mm
Lug-to-Lug
51mm
48.6mm
Lug Width
22mm
20mm

Crystal & Dial

3 specs
AR Coating
Anti-reflective coating on inner surface
Dial Color
Black
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

7 specs
Caliber
Orient F6722
6R54
Beat Rate
21,600 vph
0 vph
Power Reserve
40h
72h
Jewels
22
24
Hacking
Yes
No
Hand-winding
Yes
No
Complications
Date
None

Pricing

1 specs
MSRP
$455
$1,500
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