Received this watch as a gift. It had previously belonged to my grandfather. Fairly certain it's a 1951 (date code is L1) Director 'A'. Not sure if this is the original band or not. I doubt he would have changed the band, but it looks different from any of the ads I've found. Back of the band has "SPEIDEL Pat 2.689.450" stamped. Haven't taken the case apart as I've never done that with a timepiece before and I'm nervous about attempting it for this first time on this particular one.
1951 Bulova Director
1951 Director "A"
Thank you for sharing your heirloom watch with us. A very special gift indeed. Like this one https://mybulova.com/watches/1952-director-6876
1951 Bulova Director "A"
Director "A"
Wow - a wonderful heirloom, make sure to have it professionally serviced if you plan to wear it regularly. My guess is that the band is a more recent replacement and not original. It's possible the original wore out or just broke.
1951 Bulova Director A