Patek Philippe

In production for 21 years starting in 1961, the reference 3445 ‘monodate’ was the first automatic waterproof simple calendar wristwatch produced by Patek Philippe 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.