Well. I've been back to this one several times over several days and searched by date, case, dial and movement. Looked at shape, lugs and for recessed crown. I find what appears to be this dial (stepped center circle w/ dots & 4 diamonds) on a 1959 BB "EE" and companion "FF" in yellow. Lugs are different and case back / profiles are different. No illustrated examples that I can find from 1958 to 1965.
Here are my thoughts on possibilities, noting stripped dial: It's an unknown BB model dated 1964 It's a non-date verified earlier unknown BB with a replaced back that is dated 1964 It's a marriage of convenience of the dial and movement from a late 50's BB "FF" or "EE" in an unidentified Bulova donor case.
I don't recognize the case at all; Yellow Beau's in this time frame generally had bubble backs or slightly domed plated case backs with ring. Does that mean anything? I don't know. Dial is obviously a factory assembled diamond dial that appears to only be seen per ads in 1959.
My gut feeling is a combination of all bulova parts, but there is no proof it is or isn't. I suggest that for the time being; either call it a Generic 1964 Beau or unknown. I would hate to call it potential non-conforming without proof.