I had a Utica 20 which was made by the Toledo Arms Co. I've seen other in 12 which were clearly Crescent doubles. Ithaca bought out Toledo Arms. As noted I suspect Utica Arms was just a trade name.
I have seen other Toledo Arms pump guns and another double which used the Lefever ball and socket joint. Much to my regret Mike99 out bid me for that one and I never saw it again. I suspect when DMLefever closed for good in Ohio one of his sons who must have worked for Toledo Arms for a short while where they used a design he had been using all his life. This is the only non Lefever maker I've seen using the ball and socket joint system.
I have read several passages in the past of Toledo marked (Union F.A. ) doubles having the Ball & Socket pivot but I have yet to see a gun or pictures of one. The Waverly Arms SxS most definitely has it and a Lefever-esque cocking hook.
I will go with Hopkins & Allen as the maker of the gun you inquired about, as they used the "LONDON FLUID STEEL" stamp on their rib extensions.
http://www.gunbroker.com/Item/646396577John
