I found this chain up by Selma Alabama was wandering does any one know what is was used for and age used a quarter for scale has has us on both sides on the end piece
This is just a wild guess so take it for what it's worth......Since it has US stamped on it I'm wondering if it could be military
and would be used for attaching horses to a hitching post.
Maybe some of the relic crowd have found something similar in the past and managed to id it.
I believe it is part of the harness for hitching a horse to a wagon and used by the U.S. Calvary. Go to the link below, scroll down to the second row of pictures and view the picture second from the left.
Your chain is off US Army harness. You don't know which branch of service used it, but it was used when pulling wagons, artillery, ambulance etc.
It could be off trace chain or as some call it "heel chain." Number 27 in this diagram.
I've owned army surplus harness with that particular type trace/heel chain with the US swivel, and I don't think they date back to the Civil War. The harness
I owned in the 1960's I doubt dated much before the 1930's.