Green Beret X5

[grasshopper62f]

I am trying to find out something about this knife that was given to me. The markings are as follows:
-imprinted on the blade---
--Commerative GREEN BERET X5
--440 Stainless
--Design PAT.P JAPAN
other side of blade---
Handmade by
Sahiro--Japan

This knife folds and locks into a "T" position

Thanks for the help