Have a bunch of these and were told that they are the door strap / sling from a Hotchkiss Jeep.
Complete description on the package is:
QTY 1 EA
DEP MAT TR
1 C-1 SEP 63
All are new and most are in the original wrapper.
38" length as they are unwrapped from the package but can be shortened or lengthened by as much as 12", black enamaled finish on the center buckel and on the 2 spring loaded hook ends. Excellent shape considering they are 40+ years old and have been sitting on my shelf for 15+ years. $10 ea. Shipping not included. (Price changed from $15 ea to $10 ea 11-27-2004)