In reading over some early Gerber literature, I discover that the early model Zytel model LST knives were cryogenic quenched.
I have always thought the early model LSTs held a better edge than current models. I thought it was due to using a much better grade steel than the current LST use. Now I can see why part of the reason is the cryogenic treatment. Not many knife companies used this in knives back then. It really improves the edge holding ability.
One of the knife companies I have worked for was Boye Knives. They use the cryogenic treatment and it really helped. I know that latter model Buck Knives have this treatment and it helps their edge holding too.
Just something I learned today that I thought to pass along about Gerber LST knives.