Model 2-5 named and documented to a SOG vet. One of five Randall's he owned to include and 18-7.5, 18-5.5, 1-7, and 1-6, all in split-back sheaths. The model 1-7 came in a black LH Johnson originally but a split-back was ordered and thus carried that way. Don't know if the 1-6 originally came in a "A" sheath or not.