Certina DS Action Diver vs Marathon GSAR

Both are dive watches in the upper tier. In short: the Certina DS Action Diver wears 43mm vs the Marathon GSAR's 41mm — choose by wrist size. The Certina DS Action Diver 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

Spec	Certina DS Action Diver	Marathon GSAR
Movement	Automatic	Automatic
Water resistance	300m	300m
Case size	43mm	41mm
Crystal	sapphire	sapphire
Style	Dive	Dive
Price tier	Upper	Upper

Which should you buy?

The Certina DS Action Diver wears 43mm vs the Marathon GSAR's 41mm — choose by wrist size.

Where to buy

Certina DS Action DiverSee price on AmazonCheck price

Marathon GSARSee price on AmazonCheck price

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FAQ

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

Which is better value, the Certina DS Action Diver 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:

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