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S.U.F Helsinki 180NNvsSeiko Prospex Sea 1968 Heritage Diver's GMT

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

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What people say

Owners + reviewers, side by side

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

S.U.F Helsinki 180NN

Owners widely praise the S.U.F Helsinki for its exceptional case finishing and unique design, highlighting its proprietary Scandi-noir numerals and lollipop seconds hand. The watch features a minimalist dark silver fumé dial and is constructed from Finnish steel. Some reviewers note its price is high, often discussed in comparison to other field watches. Overall, owners and reviewers rate the S.U.F Helsinki highly for its distinctive design and meticulous finishing.

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

13 of 29 specs differ
Diameter
180NN38.7mm
Prospex Sea 1968 Heritage Diver's GMT42mm
Power Reserve
180NN42h
Prospex Sea 1968 Heritage Diver's GMT72h
Water Resistance
180NN100m
Prospex Sea 1968 Heritage Diver's GMT200m
MSRP
180NN$3,480
Prospex Sea 1968 Heritage Diver's GMT$1,500

Full specifications

Case

6 specs
Category
Diver
Diameter
38.7mm
42mm
Thickness
9.4mm
12.9mm
Lug-to-Lug
46.4mm
48.6mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
100m
200m

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

3 specs
Caliber
Soprod A10
Seiko 6R54
Power Reserve
42h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$3,480
$1,500
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