Today it seems bigger is better, but it has not always been this way. In the 1930’s smaller was seen as more of a technical achievement as people where used to large pocket watches. This Eterna is 31.3mm but has quality to it without being flashy. It tells me the time and then disappears under the shirt sleeve. It also has one of my favourite movements the Eterna calibre 520. This one is not running and has a worn upper barrel arbor hole.