1920's Japanese Satsuma button 3/4" inch, NBS small? medium?. Its a tight squeeze through the small sizer. The border sticks out a hair over 3/4" inch. Signed on back; circle black background then a criss cross inside. Very heavy gold details. Cobalt blue border with Greek link design in gold. ALSO the hole you sew through is 1/8" big enough to fit a button adapter to make it a pendant. Stunning button in very good condition. I use the NBS flat sizer.
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