Side by side

HELM MiyakovsSeiko 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.

HELM Miyako

HELM Miyako owners widely praise its exceptional value and quality, with multiple reports highlighting its stunning appearance and dial details. The watch is noted for its excellent accuracy, with figures around +1.5 to +2 seconds per day. One owner found the HELM Miyako to be tough and versatile, fitting well on a 6.6-inch wrist. Overall, owners consider the HELM Miyako an amazing value and a great watch, worth the wait for its availability.

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

11 of 29 specs differ
Diameter
Miyako40mm
Prospex Sea 1968 Heritage Diver's GMT42mm
Power Reserve
Miyako42h
Prospex Sea 1968 Heritage Diver's GMT72h
Water Resistance
Miyako200m
Prospex Sea 1968 Heritage Diver's GMT200m
MSRP
Miyako$375
Prospex Sea 1968 Heritage Diver's GMT$1,500

Full specifications

Case

4 specs
Diameter
40mm
42mm
Thickness
13.75mm
12.9mm
Lug-to-Lug
47mm
48.6mm
Lug Width
22mm
20mm

Crystal & Dial

4 specs
Crystal Shape
Double-Domed
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
Gray
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

2 specs
Caliber
6R54
Power Reserve
42h
72h

Pricing

1 specs
MSRP
$375
$1,500
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