Cool little Nurses type watch. I believe the crystal matches the Lido, American Nurse, and Sport. I dunno which with this nice little tricolored.
Interesting watch. Once again these black dials. Most likely this is a dial variant of a 1939 American Nurse.

This is a real beauty! Love those grey/black dials. I also think this is most likely an American Nurse variant but on watches with similar dials I have we have gone with Unknown. Like this one is like a Lady Bulova https://mybulova.com/watches/1939-unknown-9431 and this one is like a Clara Barton https://mybulova.com/watches/1939-unknown-9468
All I know is they are super cool!
Unknown
Cool watch to be sure. I'm afraid at this point, I have to go with unknown as well.
1939 Unknown
It's curious that these watches show up with dial configurations that we have never, ever seen in Bulova adverts. I wish knew the source of these black/gray/white beauties.
1939 Bulova Unknown
Just noticed that the dial has seconds indicators at 5, 10 15, 20 etc, so would be correct for a center sweep second hand.
Based on Jim's new ad find I wonder if we should look at this as an American Nurse?