Here are a few photos of a Stockman sheath. One author has incorrectly identified these maybe a couple of hundred sheaths (at most) as from a "mystery maker", and RMK stamped sheaths from the period are the Stockman sheaths. Nothing could be further from the truth. The RMK stamped sheaths from the period, roughly 1959-62, are in fact Heiser-Keyston-Lichthenberger sheaths. Stockman sheaths were supplied intermittently as a stop gap, are unmarked, and of lesser quality than both HKL and Johnson.