I got this Heuer in the mail a few days ago and I absolutely love it - - so much so that I'm going to sell my Doxa Sharkie to pay for it! Ha-ha.
It's a mid-'70s model with the Calibre 12 automatic chronograph powerplant. The bezel is a perfect 46mm across (without crown or pushers). It's also quite "short" from top to bottom, so it doesn't extend out from my scrawny 6.875" wrist!
Based on the styling, it's hard to believe this watch was made before "disco" became popular!