WatchSpecDBwatches, by spec

Tissot Seastar 1000 vs Marathon GSAR

Both are dive watches in the upper tier. In short: the Tissot Seastar 1000 wears 43mm vs the Marathon GSAR's 41mm — choose by wrist size. The Tissot Seastar 1000 is automatic, 300m water resistance, 43mm, sapphire crystal; the Marathon GSAR is automatic, 300m water resistance, 41mm, sapphire crystal.

Last verified 2026-06-27 · specs from manufacturer data · tier = price band, confirm the live price at the retailer

SpecTissot Seastar 1000Marathon GSAR
MovementAutomaticAutomatic
Water resistance300m300m
Case size43mm41mm
Crystalsapphiresapphire
StyleDiveDive
Price tierUpperUpper

Which should you buy?

The Tissot Seastar 1000 wears 43mm vs the Marathon GSAR's 41mm — choose by wrist size.

Where to buy

Tissot Seastar 1000See price on AmazonCheck price

Marathon GSARSee price on AmazonCheck price

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which watches we compare.

Ordering a watch? Amazon Prime includes fast delivery on eligible items, and eligible new members may be offered a free trial. Delivery speed and return terms vary by item, so check the listing when sizing is a gamble. See if you can try Prime free →

Affiliate link — we may earn a commission on qualifying sign-ups, at no extra cost to you. Current terms are on Amazon's page.

Neither of these quite right? Answer five questions — wrist size, what it's for, battery or automatic, whether it gets wet, budget — and see which of the 128 watches actually fit →

FAQ

What's the difference between the Tissot Seastar 1000 and the Marathon GSAR?
Both are dive watches in the upper tier. The Tissot Seastar 1000 is automatic, 300m water resistance, 43mm, sapphire crystal; the Marathon GSAR is automatic, 300m water resistance, 41mm, sapphire crystal.

Which is better value, the Tissot Seastar 1000 or the Marathon GSAR?
Both sit in the upper tier, so it comes down to movement, water resistance and case size — see the spec table above.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-27. Copy a ready-made reference:

More dive comparisons: Casio Duro MDV106 (Marlin) vs Orient Ray II · Seiko Prospex Turtle SRPE vs Seiko Prospex Solar Tuna SNE575 · Christopher Ward C60 Trident vs Marathon TSAR · Seiko Prospex Sumo SPB103 vs Casio G-Shock Frogman GWF-A1000 · dive watches under ~$1,500 · all dive watches · all comparisons