![Reference 3940 'First Series' A yellow gold perpetual calendar wristwatch with moon phases, 24-hour, and leap year indication, Made in 1987 | Fine Watches | 2021 | Sotheby's Reference 3940 'First Series' A yellow gold perpetual calendar wristwatch with moon phases, 24-hour, and leap year indication, Made in 1987 | Fine Watches | 2021 | Sotheby's](https://sothebys-md.brightspotcdn.com/dims4/default/c65068f/2147483647/strip/true/crop/3200x2471+0+0/resize/385x297!/quality/90/?url=http%3A%2F%2Fsothebys-brightspot.s3.amazonaws.com%2Fmedia-desk%2F8c%2F42%2F092dd1e241bb8eba5a07deeb6e44%2Fn10846-c2hbf-2.jpg)
Reference 3940 'First Series' A yellow gold perpetual calendar wristwatch with moon phases, 24-hour, and leap year indication, Made in 1987 | Fine Watches | 2021 | Sotheby's
![The Two Watch Collection: The Patek Philippe 3940 And The A. Lange & Söhne 1815 Chronograph - Hodinkee The Two Watch Collection: The Patek Philippe 3940 And The A. Lange & Söhne 1815 Chronograph - Hodinkee](https://hodinkee.imgix.net/uploads/images/1470145593058-lcn34oc5d6j-4f1d1f6da56f5247652a644ea6873e10/PP3940ALS1815-1.jpg?ixlib=rails-1.1.0&fm=jpg&q=55&auto=format&usm=12)
The Two Watch Collection: The Patek Philippe 3940 And The A. Lange & Söhne 1815 Chronograph - Hodinkee
![Reference 3940 | A platinum perpetual calendar wristwatch with moon phases, 24 hours and leap year indication, Circa 2000 | 百達翡麗| 型號3940 | 鉑金萬年曆腕錶,備月相、24小時及閏年顯示,約2000年製| The Reference 3940 | A platinum perpetual calendar wristwatch with moon phases, 24 hours and leap year indication, Circa 2000 | 百達翡麗| 型號3940 | 鉑金萬年曆腕錶,備月相、24小時及閏年顯示,約2000年製| The](https://sothebys-md.brightspotcdn.com/dims4/default/fe791bb/2147483647/strip/true/crop/2310x2383+0+0/resize/800x825!/quality/90/?url=http%3A%2F%2Fsothebys-brightspot.s3.amazonaws.com%2Fmedia-desk%2F94%2F41%2F151f728d4324b914332163408c16%2Fhk1216-c5bjr-2-t2-crop.jpg)