Honestly, I’m thinking it’s either a very unique ww2 theater made knife, definetly not made in any islands, but maybe Australia? Or NZ? Or it’s Vietnam. The construction looks a little similar to some Vietnam theater knifes, the Sheath also reminds me of those same styles with the little pocketing the outside.

Here's a late 60s 70s West German Subdued SEVEN STEPS TO HELL Tab, Black Back.  

Very sorry to see this, My Condolences to his family and his Forum Friends.

That is a very nice display. I like it! 

Wax? why not use the scotch guard water proof spray? I have the Vietnam era canvas, the rubberized and the nylon. The nylon stinks! Everything falls out of it when opened.

The blade reminds me of a modified fighting/utility knife, (1219C2), from one of the manufactures.  If it's theater made, I'de ask; which theater and where & when.  It seems very unique and I suspect it was done more recently than WW2.  It would be nice to know the back story of this knife.  It's a cool knife, but without real provenance I'd keep it in my curiosity part of my knife collection. 

Nice finds!

That is too cool! Back in my day a fire truck was as good it got.

T123 gun

It is dated 1954. The markings say it belongs to a m123 gun.