勞力士，精細及罕有，不銹鋼自動上弦腕錶，配日、月、星期三曆及月相顯示，“Precision”，型號8171，約1950年製

Rolex has produced only two different models of wristwatches with complete calendar and moon phase, references 8171 and 6062. Both models are automatic, however reference 8171 has a snap-on case back, while reference 6062 is fitted with a water-resistant-type screw-down case back and thus carries the designation “Oyster” on the dial. Reference 8171 is 38mm in diameter, which was remarkably large for the era giving it very modern proportions, whereas reference 6062 is 36mm in diameter. Reference 8171 was made in a very small series between 1949 and 1952, mostly in yellow gold, with examples in pink gold or far more uncommon, in stainless steel.