Success! After several failed attempts, I finally was able to get the correct wrap for the closure on one of my silver arm rings. This style in general shows up in a number of Viking-Age Scandinavian finds, but this piece in particular is based on one from Rollag municipality in Buskerud county, Norway; the original is held at the Cultural History Museum in Oslo and is shown in the last photo.
This piece is also currently available: https://www.etsy.com/listing/655705214/sterling-silver-viking-arm-ring-rollag














