Side by side

Seestern S446 GMTvsSeiko Prospex Land Mechanical 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.

Seestern S446 GMT

Owners widely praise the Seestern S446 GMT for its stunning finishing and extreme value, with a sapphire crystal and adjustable clasp. The winding action is noted as buttery smooth, and the 39.5mm case size is considered very wearable. Some owners, however, flag the lume as a weak point and one owner found the bracelet clasp lacked sufficient micro-adjustment. The Seestern S446 GMT is considered an extreme value for the dollar. Overall, owners rate the Seestern S446 GMT highly for its exceptional finishing and value proposition at its price point.

Seiko Prospex Land Mechanical GMT

Owners widely praise the Seiko Prospex Land Mechanical GMT for its faithful reconstruction of a classic design, comfortable bracelet, and attractive gray dial with a bubbly crystal. Reviewers highlight its handsome everyday sports watch appeal, solid specifications, and classic Seiko diver aesthetics, offering great value. However, community members are divided on the 6R movement's accuracy, with some reporting significant deviations even after regulation, while others find it competitive for the price. A point of contention is the GMT function, with some wishing for a "flyer" style local jump GMT instead of the "caller" type, and the internal compass bezel is described as finicky and difficult to read. Owners generally consider the Seiko Prospex Land Mechanical GMT overpriced at its retail price, suggesting better value is found on sale or closer to $700.

At a glance

13 of 29 specs differ
Diameter
S446 GMT39.5mm
Prospex Land Mechanical GMT39.5mm
Power Reserve
S446 GMT41hh
Prospex Land Mechanical GMT72h
Water Resistance
S446 GMT100m
Prospex Land Mechanical GMT200m
MSRP
S446 GMT$299
Prospex Land Mechanical GMT$1,150

Full specifications

Case

4 specs
Thickness
13mm
13.6mm
Lug-to-Lug
47mm
46.4mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
100m
200m

Crystal & Dial

4 specs
Crystal Shape
Domed
Curved
AR Coating
Inner
Anti-reflective coating on inner surface
Dial Color
Cream
Black
Lume
None
LumiBrite on hands and index(es)

Movement

4 specs
Caliber
Seiko NH34A GMT
6R54
Beat Rate
3 vph
28,800 vph
Power Reserve
41hh
72h
Complications
GMT, Date
None

Pricing

1 specs
MSRP
$299
$1,150
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