I think they called this as the Colt Experimental. Dillinger has a .38 Super version of the gun tho. I’m not sure if his gun has a black grip instead of wooden.

I’ve posted this weapon back in my early days in this site tho, 30 March (or 31 in Malaysia idk).
http://sticknodes.com/members/jurygamer/activity/434143/?read_ulike_notification=539746