Case diameter

18 mm watches

On the small side by modern standards; sizes like this were the norm for mid-century watches. Lug-to-lug length and case thickness matter as much as diameter for how a watch fits.

Watchfari lists 52 references with a sourced case diameter of 18.0 to 18.99 mm, spread across 10 brands and 16 families. Sourced case diameters run from 18 mm to 18.5 mm. Every sourced movement here is quartz. The most common sourced case material is stainless steel (14 of 37).