mine has been a helluva good knife, back when i got it there werent a lot of factory made fighters to be had, so i got the mark 11 when i was in between boot and AIT in '69- paid $39.95 a hefty sum in those days (22 cent gas, brand new chevy truck 2200 dollars, ) but it has been a good knife - and, considering i wore it so much, the knife still looks pretty good, polished it up w/flitz a while back, got her good and sharp, but the sheath is TRASHED - might be time to check out blade tech for a new 1.......
i dont think they make the mark 1 or 11 anymore, think ya can still get the guardian though - i dont know about the quality on the later model blades though.......but gerber has a good rep - i occasionally see 1 at gunshows in this area , if ya want 1 check them out.....