Old Hitch ID.

Here is the hitch of my unknown camper and frame. Kroil unseized it after over half a century outside. I will have to replaced the locking bar as it was bent in the process of getting it moving again. I believe it's a 2 inch ball socket. Has anyone seen one like this? I've never seen this design before? On the tongue it says General Corp. Quincy (I think?) Cal. Short for California? Thanks for looking!

Old Camper #2 by Another Dude, on Flickr

Old Camper #1 by Another Dude, on Flickr

Trailer Hitch #1 by Another Dude, on Flickr

Trailer Hitch #2 by Another Dude, on Flickr