I am unable to open the watch so I am guessing on the date and movement model. My mother passed away and this was in her jewelry box. I think she inherited it from my grandmother.
It would be very helpful if you could take pictures of the movement and the case back to get the information we need to be able to ID the watch and date it. You may have to take it to a reputable watch repairman to have him open up the watch. If you look on the back for a tab to silp a butter knife under and pry up gently, you should be able to open the case. Then carefully lift the movement from the case and take the pictures of the back side (non dial side) then pictures of the inside of the case back.
mid 1930's may have been the correct era for this Watch after all, database ad Dated 1935:
http://www.mybulova.com/sites/default/files/vintage_ads/bulova-ad-1935-…
Top Left - 'RONA'
In reply to mid 1930's may have been the by FifthAvenueRes…