1969 Bulova Oceanographer 'F'
Case is a one piece all stainless steel, dated M9, case #2891 from W Germany; uses a split-stem and is top loading (crystal must be removed); signed crown is partially hidden; white dial with calendar window; movement is a manual winding Swiss-made 11BLCD; band came on the watch and is not a match to the ads, so likely not original, but is a Bulova band.
Ad collage from 1969/1970, with a snipet from an Oceanographer case info sheet.
In reply to Update: It looks like in… by Andersok
In reply to Interesting Ken, I think… by Geoff Baker
Yea, I think it is still the 'F', based on the info we have. I'm wondering if Bulova had used different -# after the model # to identify different options of the same watch, like a band. Perhaps the band was just picked up years later after the original failed, or the buyer saw it on another watch and decided to change it when bought; we'll never know for sure.