Ref. 3445, frequently referred to as the 'Monodate', was the first calendar wristwatch produced by the company in series. It was manufactured from 1961 until 1981.
Cal. 27-460M and Ref. 3445 are illustrated in Huber, M. & Banbery, A., Patek Philippe Wristwatches, Vol. II, Second Edition, pp. 220-221.
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