1974BULOVA - Case back:BULOVA,SHOCK RESISTANT,STAILESS STEEL BACK,N4,ANTI-MAGNETIC,WATER RESISTANT.There is no serial number on the case back. Inside case back:9513 - 11BSACB 17 jewel movement is dated N4 - Dial:silver toned dial has gold with black accents markers and hands and reads bulova,set-o-matic,automatic and dual-day under the day/date window.Also marked T SWISS MADE T on the bottom.
Cool watch Denis, I love these giant 1970 watches, I have a dozen or so of them in my collection. We never really found anything to ID them. They WANT to be Jet Stars but there are no adverts showing them as such. Later in the decade they might have been Clippers but again, no ads.
Alas, Unknown.
PS - Set-O-Matic is a sweet feature. Snap the crown fully out to advance the date, spin the crown to advance the day. You know what SWISS MADE, means, the "T" designates Tritium which glows the dial. It replaced the deadly radium used earlier.