Set of Six Vintage Rectangular Stainless Steel Napkin Rings Made in Japan

These vintage napkin rings are in excellent vintage condition with only minor signs of use. I'm not exactly sure of the time period of manufacture, but I would estimate they are from the 1950's, 1960's, or 1970's. They are such a simple, classic, modern style with no decoration, so it's kind of tough to say exactly. Measures 2 1/4" long, 1" wide, 1 1/4" high. Made in Japan