“Air-King”
The Air-King ref. 5500 is the 34 mm stainless-steel, time-only Oyster Perpetual produced from 1957 to around 1984 — one of Rolex's longest-running and most understated references. It used the automatic Caliber 1520 (or the chronometer-grade 1530, often dial-marked 'Super Precision'), on a steel…
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