Thanks William. The number that I have heard is that approximately 20% of Randalls '43 Thong Clip Fighters were fitted with Clarence Moore sheaths.
Here is a photo of a rare early '43-'44 Thong Clip Hunter in a Moore sheath. The keeper is down lower on that one.
Perhaps our more knowledgeable guys has it narrowed down to approximately when Moore dropped the keeper down. I wonder why he did? Perhaps to close the space between the mouth of the sheath and the keeper to make it a bit easier to keep the keeper open to prevent the blade from slicing the leather on the keeper?
Thanks, Sam