In reply to I love these one off watches… by Geoff Baker
I considered the possibility of connecting it to the case style as well. Perhaps classify as Calendar and designate it as variant "Crusador"?
1932 Calendar Crusador ? or vice versa
There is also the possibility that one or a few of these were produced and Bulova ran into a patent problem using the movements. Mimo (Girard-Perregaux) got the first Swiss patent in Jan 1930, apparently followed by Banner and Vertex; I believe in 1931. This may help explain why Bulova never mass produced calendar watches until the early 1950's. I would say it's a possibility they either missed the patent boat and didn't want to pay royalties to the competition during the Depression (or were refused permission) and waited out the 14 year limit on the patent before applying for their own model. Just a thought