Case diameter

51 mm watches

A very large diameter, typical of dive, pilot and chronograph designs. Lug-to-lug length and case thickness matter as much as diameter for how a watch fits.

Watchfari lists 7 references with a sourced case diameter of 51.0 to 51.99 mm, spread across 3 brands and 3 families. Sourced case diameters run from 51 mm to 51.8 mm. By movement type: 4 automatic and 1 manual. The most common sourced case material is titanium (2 of 3).