Blade marked KA-BAR with USMC on reverse ricasso.

Well made cast (or machined) aluminum alloy guard and hex pommel. (WWII Petrie knives had plated hex pommels.)

Well shaped handle of transparent green (surface painted?) Lucite (Plexiglas) rings, with 4 sheet metal (aluminum?) spacers.

The owner writes, Family lore is that there was an uncle in the Seabees and he gave this knife to my grandfather.