Syrte
··MWR Tech Support DeptThat's a good question, to which I don't know the answer. I wonder if @Syrte had an idea?
Those are very nice looking geometric patterns which predate art deco—and indeed the flourishes on the case also match the early 1900s.
There are many nice watches in this thread which are not art deco, but from various other styles of the 1910s 1920s, 1940s and 1950s, and that’s okay too 😉