Pictures didn't allow getting a close up of the front of sheath, but looking at back stitching, I'm 90 percent convinced that this sheath originally had the same type keeper strap as the one Ronnie posted. The odd patch of stitching is a remnant, longer threads that once held another piece of leather in that place. The back of the sheath above the stitching is smooth, almost grooved, indicating a strap could have been routed there. I think these two sheaths have the same maker, one with Randall stamp, one without.