Case has no markings on the back - Gold filled Symbol on movement looks like a rhombus with 10 marked in it??? I have put 1922 only so I can get this on the site for your consideration. I do not know the date. Stem and crown appears to be a replacement??
Edit: Avertisment Added: The advertisment is from 1922 add no 3 of 36 - Top "954", but this watch is 14kt white gold and the one I have is yellow gold- to me the case looks the same and the face looks the same. Case is 24mm. Lug end to lug end is 27mm Hinged Case opens from the side
Edit: Changed date to 22 from 24
In reply to Thinking 953...now to prove by mybulova_admin
In reply to Sure looks like the 954 in by William Smith
I was just thinking that the '10' inside the rhomboid denotes 10 ligne, and the AI is the model of the movt, so it is a 10AI. This might be the way they ID'ed the movts before they started using the system we are all more familiar with.
Or did we cover this already? Anyway, this is the ubiquitous FHF Robert movt.