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. Production of the model ceased in 2004.
Ref. 3970 is illustrated in Huber, M. & Banbery, A., Patek Philippe Watches, Vol. 2, Second Edition, pp. 305.
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