Bulova 1966 Banker "K"
This one appears to be a first for the database: 1966 Banker "K". Light corner wear with a little more on the case back and some speckles on face. Case and movement both marked M6. Replacement band was on it when I got it; a pretty good match to case engraving.
Listed in 1967 ad as available with silver or gilt dial. Dial on subject watch is what I would call champagne, so I am assuming it's the "gilt" version.
Found this accurate runner online listed for sale as a "ladies watch" .