Hello Sir,
AFAIK, it's nothing special - from that site, a "Grey Armorhide, type 2", made in early 1971 (a month or so before I bought it in Ft. Bragg).
A number of my compatriots had bought them and succeeded in snapping the tip of the blade off by throwing them - mine was the only one of that bunch I know of that survived..
Hartley