Movement date code M9, visible in a photograph to be submitted.
11/16" strap lugs. 18 mm is a tight fit and workable; 17 mm is a bit loose. Case is approx. 32.5 mm diameter across the two horizontal corners.
Dial is inscribed "Automatic", as opposed to "Self Winding" which I saw on some earlier examples of this design.
Back is inscribed only with Bulova, the case ser. #, date code N0, and "stainless steel case". Earlier examples on MyBulova indicate waterproof, anti magnetic, and shock resistant. I am certain these features are present in this watch - though the standard for "waterproof" at the time was far more loosely defined than it is now. I expect the requirements for back engraving were changed somewhere between 1968-1970, causing the change to what is seen here.