In reply to Good point about the logo,… by neetstuf-4-u
Excellent observation that I now see after posting comment above. Well done Ken! I was focused on the premise it was a US production watch. The serial number starting with a "3 " followed by a dash could very well be an indication of a non US production watch. Here is a clip from the ad you reference. Case of subject watch on the left. Face could very well be an original to the case (variant unknown) that has been scrubbed.
Undersize Tuning Fork below "12" - "Bulova" under tuning fork and 2 lines of text above "6". Recessed crown at "3" position would be a good indication it's a mechanical movement. Others in the ad that have crown at "4" have "Bulova Accutron" on dial.
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1970 Unknown International Model