I'm unsure of the year and the case back says " BULOVA NO C13823 10 KT.R.G. P CASE".
Either my Grandfather or Father received this watch from Ralston Purina for selling Hog Chow (pig feed). They both owned feed stores that sold Purina. Grandpa started selling in the '30s and opened his store in 1951. Dad sold Purina until his passing in 2014.
I found this watch in the "junk drawer" and had it serviced which included new main spring.
They didn't record or take photos of the movement when being serviced.
The watch cleaned up nice and I will treasure it.