Sinn 556 I vs Hamilton Khaki Field Titanium Auto

Both are field watches in the upper tier. In short: the Sinn 556 I takes more water (200m) — both are fine for swimming, but it has more margin if you dive. The Sinn 556 I is automatic, 200m water resistance, 38.5mm, sapphire crystal; the Hamilton Khaki Field Titanium Auto is automatic, 100m water resistance, 42mm, sapphire crystal.

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

Spec	Sinn 556 I	Hamilton Khaki Field Titanium Auto
Movement	Automatic	Automatic
Water resistance	200m	100m
Case size	38.5mm	42mm
Crystal	sapphire	sapphire
Style	Field / explorer	Field / explorer
Price tier	Upper	Upper

Which should you buy?

The Sinn 556 I takes more water (200m) — both are fine for swimming, but it has more margin if you dive
The Sinn 556 I wears 38.5mm vs the Hamilton Khaki Field Titanium Auto's 42mm — choose by wrist size

Where to buy

Sinn 556 ISee price on AmazonCheck price

Hamilton Khaki Field Titanium AutoSee price on AmazonCheck price

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FAQ

What's the difference between the Sinn 556 I and the Hamilton Khaki Field Titanium Auto?
Both are field watches in the upper tier. The Sinn 556 I is automatic, 200m water resistance, 38.5mm, sapphire crystal; the Hamilton Khaki Field Titanium Auto is automatic, 100m water resistance, 42mm, sapphire crystal.

Which has better water resistance, the Sinn 556 I or the Hamilton Khaki Field Titanium Auto?
The Sinn 556 I, rated 200m, versus 100m on the other. Pick 100m or higher for swimming and 200m+ for diving.

Which is better value, the Sinn 556 I or the Hamilton Khaki Field Titanium Auto?
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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