Regrettably, I don’t own this one. I’ve shown it here before, and I’ll beg your indulgence by showing it again, before it goes back to its owner.
This watch is a Hamilton Ball watch, 23-jewels, basically, a Hamilton grade 950E (E stands for Elinvar). This movement is sort of transitional between the earlier Hamilton grade 950, and the later 950B. The case is white gold filled, and its condition is exquisite, as is the ORRS Ball vitreous enamel, Montgomery 12-hour dial, and the movement. Movement S# B649675, Wadsworth Ball Model white gold filled case S# 7802262.
Here is the pocketwatchdatabase information on this handsome artifact. Not extremely rare, but very rare in this condition.
https://pocketwatchdatabase.com/search/result/ball/B649675
The data base dates this watch is circa 1941. In 1941, the 950B was introduced, so I believe this one to be earlier than 1941. That, plus by about 1941, Hamilton had changed the design of the spokes on the train wheels. This watch has “swedged” spokes on the train wheels, where Hamilton no longer swedged the spokes after 1941. The 950E (this watch) was introduced circa 1931. This one is from the second run of this model. I believe it was likely made circa 1935.