1965 (M5) Bulova Chronograph. Valjoux 92 movement marked Bulova Watch Co M5 Swiss 13EB. 35.1mm , 41.88mm lug to lug , 12.06mm thick(crystal dependent), case is gold plated 40 micron. My suspicion is the the dial has been redone with a little artistic license taken on the Bulova logo. This one has applied raised letters, the few others I have seen have had printed lettering.
Interesting note for this watch is that the case number is only 58 away in sequence from another 65 chrono documented here. Either a happy coincidence, which happens, or a possibly a very short run of these. Also, in looking at mine, and the other example documented here, the case serial number and the Bulova 2 character date code appear to be hand etched or engraved. Another indicator that there may have only been a short run of these watches.