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Reference 3445 Calatrava | A yellow gold automatic wristwatch with date, Circa 1970

In production for 21 years starting in 1961, the reference 3445 ‘monodate’ was the first automatic waterproof simple calendar wristwatch produced by <a href="https://www.sothebys.com/en/buy/luxury/watches/watch/patek-philippe" rel="noopener noreferrer" target="_blank">Patek Philippe</a> in series. Often perceived as the successor to the reference 2526, the 3445 carries the caliber 27 460 M (mono-date) that was similarly launched in this year. Whilst not as lavishly finished as 2526, the 27 460 proved a reliable and versatile heartbeat for other models such as the Perpetual calendars reference 2448 and 2450. In the late 1970s, the model received an update, with a higher bezel fitted along with sapphire crystal, and updated reference number 3445-100.

Patek Philippe Calatrava (Reference 3445). A yellow gold wristwatch with date. 1964

Reference 3457 Calatrava | A yellow gold wristwatch, Circa 1960

Patek Philippe Perpetual Calendar Reference 3940R The Reference 3940 was introduced by Patek Philippe in 1985 and production officially ceased in March 2006. As the successor to&nbsp;references 3448 and 3450, it was manufactured in three series over&nbsp;a 20 year production period. <ul><li>Please note the image is a representative image of this item and not a photograph of the exact item available for purchase. For exact specifications, please use the Enquire function for further assistance from our team.</li><li>Please note that availability of this item is subject to change based on market conditions. For details please use the Enquire function.</li></ul>

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