two more:

==================
Frankie Darrow
at roulette table in "Destination Murder" (1950), per the eBay seller, though IMDb does not list him in the credits. He is at the far end of the table, has dark hair.
http://www.antiquegamblingchips.com/StillsB_OtherMaleActors.htm
.

.
=================================
"The Lone Wolf in Mexico" (1947) roulette scene. Movie stars Gerald Mohr (2nd on the left?) as the "Lone Wolf," and I don't recognize anyone else in the still. I own a lobby card of the same scene.
.

.
============================

Robert