Vintage Bulova "Directors" men's mechanical wrist watch in very good Running condition.
I have not opened the Stainless Steel case back, but the date code is "L3" and the serial number is 6601231, which points to  a 1953 model with 15 jewels, and a 10BT Swiss Movement.
The word "Swiss" appears below the numeral 6 on its face
Bulova advertising of that era stated that this "Director" watch (catalog # D0538TE) has a 10K Yellow Rolled Gold Plated  fancy snap on case, and a Domed "Lucite" Crystal.
A 2 piece Faux Leather (Plastic ?) band included.
My father purchased the watch when it was new, but it has been in a jewelry box for many years.