Hugh Wright (now deceased), who's "job" it was at the Randall shop was to inventory and received sheaths from Heiser and Maurice Johnson (starting in 1960) told me Heiser (and I quote) "Never" had a Randall stamp. I believe him. Hugh also stated that he saw Maurice Johnson in the Randall shop 1-2 years before Gary started working in the shop, upon his graduation. It's a JRB. Even the leather and stitching look correct for an even later JRB.
Just sayin', Capt. Chris
PS: I know I'll get crucified for this entry but it didn't come from me folks...CCS