This is a Galco Holster known as the Yaqui Slide, model YAQ212.
The minimalist design and near-vertical carry angle make the Yaqui Slide very fast to draw from" while securing the firearm during everyday activity. The belt channel on most Yaquis has a circular cut-out for placement on the pant loop to prevent shifting of the holster. The open-muzzle Yaqui design is a favorite of those who own multiple barrel lengths of the same gun model. Constructed of premium saddle leather" the Yaqui Slide fits belts up to 1 3/4" and is made for semiautomatic pistols and double-action revolvers.
Features:
Premium steerhide
Adjustable tension units
Neutral cant
Accommodates multiple barrel lengths on similar frame size
Fits belts up to 1 3/4"