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Lot No. 242
Estimate  9,000 - 20,000 €
This is a lot of a former auction!

Rolex "Oyster Perpetual Tru-Beat Superlative Chronometer officially certified"

, Movement No. N674197, Case No. 138703, Ref. 6556, Cal. 1040, 35 mm, circa 1955

An extremely rare automatic vintage wristwatch with jumping centre seconds

Case: steel, screw back ref. 6556 I/56, screwed "Twinlock" winding crown, later steel "Oyster" bracelet ref. 78350/19 with endlinks stamped 557, clasp K3, bracelet length 155 mm, total length 200 mm. Dial: silvered.

Reference 6556 was produced predominantly in stainless steel with a very few examples in gold. The 1960 catalogue stated that the system was be replaced by the new reference 1020 but this was never launched. The interesting extra mechanism for the independent jumping seconds is made of beryllium and composed of a lever that allows the seconds wheel to jump, therefore allowing the usual going seconds hand with a beat of 18,000 to beat once per second.
Illustrated and described in "Rolex, Collecting Wristwatches", by Osvaldo Patrizzi, 2001 Edition, p. 194-197.
Case: very good, slightly worn
Dial: very good
Movm.: very good, capable of running, cleaning recommended

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