1974 Jet Star
Here's another big one from the 70's.The case is 44.05mm lug to lug x 38.05 without the crown.
Outside caseback:BULOVA,N4,WATER RESISTANT,BASE METAL BEZEL,STAINLESS STEEL BACK and the serial #.
Inside caseback:3330 stanped in ink.
Rotor:BULOVA WATCH CO,11BSACB,N4,SEVENTEEN 17 JEWELS UNADJUSTED SWISS.
Original crown marked B.
There's a 1973 ad calling this a Jet Star and the #12620.Forgot to mention it has what they call a gold shaded dial which reads only BULOVA and AUTOMATIC.