• cal 27-70Q manual winding movement stamped with the seal of Geneva, 24 jewels • silvered dial, apertures for day and month, three subsidiary dials indicating constant seconds combined with 24-hour indication, 30-minute register combined with leap year indicator and date combined with fan-form aperture for moon-phases • concave bezel, screw-down case back • case, dial and movement signed • platinum Patek Philippe buckle • Extract from the Archives confirming sale 27 May 1993, box, packaging
Patek Philippe launched Ref. 3970 in 1986 and two years into production, modified the design to a screw-down case back and continued production for approximately two years. This water-resistant model was designated 3970E, with the suffix indicating étanche, or waterproof. Production of the model ended in 2004.
Ref. 3970 was created following the success of the exceptional and iconic Ref. 2499. One main difference between the two models is the addition of the leap year indicator to the 3 o'clock subsidiary dial and 24-hour indicator to the 9 o'clock subsidiary dial. The design of the case of Ref. 3970, with its downturned, fluted lugs, is clearly influenced by the form of Ref. 2499. For an example of Ref. 2499, see lot 195.
Ref. 3970 is illustrated in Huber, M. & Banbery, A., Patek Philippe Watches, Vol. II, Second Edition, pp. 305.
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