I don’t know the exact Size of The Watch Case, I added 34mm, but I also have the Gold filled Band but the band is in pretty rough shape.
It could be 36mm actually but the watch is from the 50’s-60’s for everything I’ve been able to find.

Up to buyer to do due diligence if wanting a certain it exactly reference or Case size. I wasn’t able to get a clear answer and I don’t have a micrometer to measure.