This is a Galco Holster known as the Speed Paddle, model SPD192.
Featuring an open top design for speed" covered trigger guard for safety" and tension screw adjustment for added security" the Speed Paddle(TM) adds convenient on/off ability to the equation. This holster also includes Galco's copolymer injection-molded belt-lock paddle" which makes it possible to put on and take off this holster without removing your belt. Constructed of premium saddle leather" the Speed Paddle fits belts up to 1 3/4" and is available for semiautos and double-action revolvers.
Features:
Premium steerhide
Adjustable tension unit
Slight butt-forward cant
Injection molded contoured paddle
Detailed hand molding for excellent handgun retention
Fits belts up to 1 3/4"