Your coupling seems to be similar to the "Locktite" coupling used on John Walsh caravans. See this post in the "Old Tow Couplings" thread.
The main difference with yours is the flat section on the top of the main coupling body, so it may not be an actual Locktite version. Can you see any evidence of a Patent number stamped on the side of the ball holder, usually where the pin is hammered through the spring-loaded shaft?
Thanks rattles have bought one of these hitches but am hopping to get one like the original like Franklin 1 has posted as my hitch goes in between the steel frame and to put another kind on would mean altering the draw bar thanks for the help as now i know what i am looking for chris
Restoring 1934 jennison roadcruiser 10 ft 1963 Jennison pathfinder 30 ft 1961 jennison pathfinder 17 ft restored 1957 jennison pathfinder 14 ft And 55 fj special sedan Portarlington vic
You are only missing the handle/latch, Any chance of fabricating a new one or removing the one off the purchased new one (remove the C Pin), and either Drill/Shim the handle to suit the old Coupling and alter the spring loaded lock mechanism to suit.
Unless there is wear/Broken Part on the old coupling, a Strip down and clean/grease the original should be serviceable.