Photo by Daniel Zimmermann (CC BY 2.0), via Wikimedia Commons · Sinn 556 I, macro dial close-up.
556
Sinn’s 38.5mm everyday-wear line: pared-back dial, sapphire crystal, the brand’s simplest credible entry. The 556i (indices) and 556A (Arabic) are the staples; the line is the watch a Hamilton Khaki Field buyer cross-shops against.
References in this family
Which ref to buy
The 556 is Sinn's entry instrument watch -- a 38.5mm three-hand with applied indices, no-nonsense design, and ETA movement at a price that challenges everything in its class. It is the first Sinn most buyers own and the watch that defines the brand's value proposition: German tool-watch specification for less than Swiss alternatives.
- 1Open
Sinn 556 I -- the entry Sinn instrument watch; one of the best-value serious watches under $1,500.
- The case for it:
- ETA 2824-2, 38.5mm, sapphire crystal, hardened steel case, applied angular indices. The 556 I variant adds Sinn's TEGIMENT technology for hardened case surfaces. This is a genuinely useful, wear-anywhere instrument watch at a price where most competitors are cutting corners.
- Consider instead if:
- The ETA movement is not special -- this is the same caliber found in a hundred other watches at lower prices. Sinn's value comes from case quality and German provenance, not movement innovation.
Rankings last reviewed 2026-06-07. Editorial perspective only. Not financial advice.