Unusual silver bracelet with details from Japan with alternate sizing

This is a lovely solid bracelt with beautiful triangle shape details on the body of the bracelet. It is marked Japan on the back of the clasp. There are three alternative sizes for the bracelet from approximately 6.25 inches to 7 inches. A lovely and unusual bracelet in excellent used condition. I think this piece may be from the 1950s or 1960s when my Aunt traveled to Japan.