Have not been able to find an ad.
Back of case indicates waterproof and 14k, as does the band clasp (14k, not waterproof!)
Another one of my father’s watches. He was apparently a Bulova fan!
Very nice heirloom watch! Looks to be a match to the Accutron Day and Date 'C'. The ads I have found for the 'C' variant call for either a silver or gilt dial option. Other models with dial color options tend to have different variants for each color, so I am not certain which color 'C' is specific to. Until we know, this will likely be the 'C' variant.
1968 ad:

-Ken
I like it.
1968 Bulova Accutron Day and Date C
1968 Bulova Accutron Day and Date "C", nice watch
Another great heirloom for you to have.
1968 Bulova Accutron Day and Date "C"
Thanks very much, panel members. I think I’ve been bitten by the Bulova bug!
Nice watch, I agree
1968 Day and Date "C"