Rolex has produced only two different models of moonphase wristwatches, references 8171 and 6062. Both models are automatic, however reference 8171 has a snap on back, while reference 6062 (see lot 349 in this auction), the Oyster version, is fitted with a water-resistant-type screw back.
Reference 8171 was made in a small series between 1949 and 1952, mostly in yellow gold. Examples in pink gold (see lot 18 in this sale) or in stainless steel are very rare.
Consigned by a private collector, the present watch furthermore stands out by its excellent overall condition and the attractive silvered dial. The case is crisp and still retains the finely engraved case number and Rolex crown to the case back, the dial does not show any cosmetic enhancements but only some slight ageing.