Apparently this is a WWII Bantam trailer

[maple_leaf_eh]

The construction of the hitch/lunette on the 1953 1/4 ton trailers is simple. There is a big steel casting that bolts to the diagonal draw bars. This casting has a through-hole. The lunette is simply a cast loop with an exterior threaded shaft with a stop face. It spins freely with greasing. There is a big castle nut that holds the shaft in the hole, and IIRC, is cushioned with a coil spring.

From a quick look at the Kijiji pictures, the original casting is either gone or covered with the sheet metal trailer ball hitch. No way of knowing how much of the original casting remains. If the lunette itself has been modified or damaged, it should be replaced. The shaft is likely a common exterior dimension, so a civilian to military or vice versa conversion would be easy.