Air-King 5500 — Super Precision Dial

Dial reads “Super Precision” above six o’clock, which usually marks a 25/26-jewelJewelA natural or synthetic stone used as a bearing or endstone for a movement pivot. caliberCaliberThe designation of a watch movement, identifying its design or movement family. 1530 inside. The earlier pairing: the 1530 was used first. Not a firm rule, since service parts and loose factory practice mixed dials and calibers.