For the "vintage" (if the sheath he has listed came out about the same time as the blade), I think it's a "dug-up"! Prior to certain low-lifes getting "found out", the shop used to bury all of their mis-forged, mis-stamped, faulty, etc., etc. blades in the grove. Certain individuals dug them up and sold them with a variety of "stories" (Def: LIES) about what they really were. The burial practice was canned and all blades of this nature are now cut up.
Spending all of my earlier professional life installing and servicing burglar alarms...I hate a thief!
Still do, Capt. Chris