Sorry, didn't think to include the manufacture date. It was made in 1875 (completed on Oct 2, 1875 to be exact). That was a wonderful description of the swivels, thank you for that. I was roughly aware of most of what you posted regarding the physical nature of the swivels I need. I say "roughly" because I was aware of the general configuration but not the specific measurements. In fact, if I am unable to find original replacements, if I could get detailed pictures and specs, I can just make some. Thank you very much for taking the time to reply, very much appreciated.
