Spiral Black Metal Button 15/16" / 24mm Shank Back, from JHB Italy # FJ-82
Was the designer inspired by a record? Pure matte black-on-black with a thinly engraved long spiral that doesn't show up all the time, so it's subtle. Flat not domed, another in our collection of older finer European buttons from JHB back in the day. Shank opening is about 3mm. $1.25 each, Limited Supply.