Grant’s
The Kentucky Rifle Hunting Pouch has a few examples of pick and brush sets on chains, dates ? I have looked through all of my reference material and do not see were twisted wire, like your example, was used for attaching a strap to a horn. I have seen what looks like eye hooks with the eye formed by wrapping the wire back around itself. Like this example with two tag ends that were bent over inside the horn, in the base before it was attached and one in the neck area with one tag cut off. An yes that is a piece of wire but I could twist it up quickly so that’s what I used.
Some horns with Brass, Silver or Pewter bands at the base and neck that have a twisted wire going through an eye connected to the band. In one case the eye was used to keep the bands tight. Similar to the one shown on page 140 of Grinslade’s
Powder Horns Documents of History, only smaller, like an eye hook with an eye at both ends the one for the strap being a little larger.
Now, as to time frame, I do not have good documentation for what I have seen in person and almost didn’t comment because of that.
May or may not be of help.
Tim C.