Running Watch - Yes
Beau Brummel - ?
14K Gold Case
Year 1939 - ?
17 Jewels - Yes
Welcome and thanks for sharing. Based on the case s/n starting with a "7" and a date code (square for 1946) on the movement, your watch is a 1947. I will correct the date you input above. We don't see many like yours; especially with the swiveling lug feature, it is indeed a
1947 Beau Brummell
in solid gold, like this one. I have a weakness for the Bulova diamond dials so it was a real pleasure to see this one!

Ad dated Dec.14, 1947 showing original solid gold band.
In reply to Welcome and thanks for… by neetstuf-4-u
It’s white gold not a yellow. Lighting conditions make a yellow cast upon the watch.
1947 Beau Brummell looks to be a good match. Congrats on a nice watch.
1947 Bulova Beau Brummell