The holster is a GI private purchase. The RZM marked clasp was added to it later, as the original design adjustment buckle made it harder to remove the holster with gear on. I agree that it is an SA dagger hanger clasp.
This is not an issue item and should not be priced as such. Between the pistol, holster and the yet to be seen magazines, you paid in the high end of retail, but you weren't seriously hurt.
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