3 7/8 closed hollow ground CPM-154 blade with a bushing. Integral 416 liners / bolsters with stag, mill relieved at the pivot. Half stop, shield is pinned and file worked liners.
I don't have knowledge of what kind of mechanical background you had, but you have a some major league skill! I am giddy with my "find".
Looking forward to Friday and the package. Is there a jig you use on the firework?