Movement Serial No.:
Case Serial No.:
Can you guys ID this one. It's a 1931 with a 10AN 15 jewel movement with the 1931 date code shield stamped on it, but you may not be able to see it in my photo. It has a dust cover over the back of the movement that I removed for the photos.
I don't know what the case material is. I don't see anything stamped on it.