I picked up one of those Bonney 1/2-inch drive adjustable socket jobbies at the flea today. It was attached to a Bonney 4098 ratchet, and when I made a deal for the ratchet, itself a cherished find (wartime, black oxide finish, nearly blemish-free), the vendor said, “I’ll throw in the socket that’s on it for free.” I felt guilty for not correcting him - for about a millisecond before I handed over my cash.

He was a Snap-on guy and had just quoted me some insane prices for a wartime Snap-on 71-M and some wartime sockets. He had no knowledge of Bonney and treated it like third rate.
3bay posted an example of the adjustable socket that he has had for a long time upthread back in June in post #2389, linked
here. His had a part number (2550) and patent numbers (1,554,963 and 1,554,965) both granted Sep 22, 1925. The inventor, Mr. Will H. Fisher, lived in Altoona, PA, which is on the other side of the state. They were not assigned to Bonney. So I'm not sure what's going on there either. More research required.
This one that I found has no part number and no patent numbers. Only the Bonney brand (faintly) from the 1930’s and "PATENTS PENDING". I suppose that means it's older than 3bay’s example. Note that Bonney did not even get into the socket drive business until 1929, and I suspect both are pieces are 1930’s tools despite the patent dates.
Another catalog search yielded zip. As I said upthread, all the 25XX part numbers are special wrenches in the 1930's catalogs. The 1932 cat has a 2549 (Ford special rear main bearing adjustment wrench) and a 2552 (Miscellaneous special wire wheel spoke ****** wrench). That indicates they had assigned 2550 to something (not listed in the catalog) in their stocking system, and it has to be these adjustable sockets. My hunch is it was either discontinued or available as special order only and not listed in catalogs.
Couple more shots...