Ths pattern 70 gear uses a different kind of snap hook. I'm with the others it looks like HK gear with those snap hooks. Is it as dark as it is in the picture? Does it "feel" and smell old? Could easily be from modern gear. The sliders look old though, very thin.
Or, door restraints on the Open ( Half Cab WC-22) Cab Dodge trucks from 1942 and 43!