This is a DeSantis Gunhide Shell Holder known as the 2X2X2, model A08BJG1Z0.
This unique pouch maximizes both security and speed of loading. For .38/.357cal" the six cartridges are separated in tiers which can be loaded into the cylinder in three controlled steps. The .44mag pouch and .50cal cartridge holders have a 3x3 design. Available in black or tan unlined leather. Accommodates belts up to 1 3/4" wide.
Features:
Pouch maximizes both security and speed of loading
Six cartridges are separated in tiers which can be loaded into the cylinder in two or three controlled steps
Accommodates belts up to 1 3/4 wide