This is a Uncle Mike's Shoulder Holster known as the Pro Pak, model 7501-1.
For everyday wear" their Pro-Pak holsters are the ultimate. They're ergonomically designed" simple" lightweight and super tough. Pro-Pak holsters lie flat against your body" making them an excellent choice for use under jackets. They're constructed of an extra-thin laminate with a Kodra nylon outer shell. The smooth nylon lining protects your gun's finish and aids in drawing and reholstering. Vertical carry provides excellent concealment" comfort and retention" especially with large firearms
Features:
Off-side tie-down has single mag case for autos or single speedloader case for revolvers
Right hand
Size 1
Fits 3 - 4 barrel medium autos