This one was so badly tarnished and listed as 15J, I had no idea what I was bidding on. I guessed it was an Aviator (15J) or Alderman (17J) as it appeared to be rose gold. It is indeed rose gold over a sterling base which explains the odd coloration that made the watch appear to be tarnished silver.. See last photo as I received it.
1943 Bulova Alderman
Started running on a 1/2 turn of crown and is quite remarkably keeping time.
Referenced ad is dated 1942.