185 to use or not to use

[richland]

I have owned a Buckmaster LT 185 since the early 90's. It has been all over the world with me. Afganistan, Iraq etc.
it is well used, to cut 550 cord and chop fire wood etc.
It has its share of parachute jumps with me.
I even have used it as a dive knife.
bottom line, is it concidered a rare knife?
should i retire it? I would hate to loose it.
I have had the sheath modified by the riggers to make it more secure.
would not sell it, but is it expensive to replace?