![REFERENCE 3970/E 'SECOND SERIES' A YELLOW GOLD PERPETUAL CALENDAR CHRONOGRAPH WRISTWATCH WITH MOON PHASES, 24 HOURS AND LEAP YEAR INDICATION, MADE IN 1987 | Important Watches | 2020 | Sotheby's REFERENCE 3970/E 'SECOND SERIES' A YELLOW GOLD PERPETUAL CALENDAR CHRONOGRAPH WRISTWATCH WITH MOON PHASES, 24 HOURS AND LEAP YEAR INDICATION, MADE IN 1987 | Important Watches | 2020 | Sotheby's](https://sothebys-md.brightspotcdn.com/dims4/default/8d76f5a/2147483647/strip/true/crop/1334x2000+0+0/resize/2048x3070!/quality/90/?url=http%3A%2F%2Fsothebys-brightspot.s3.amazonaws.com%2Fmedia-desk%2F35%2F68%2Fb3113cd647e19ca901a5d90a7d27%2Fn10478-bkjd2-1.jpg)
REFERENCE 3970/E 'SECOND SERIES' A YELLOW GOLD PERPETUAL CALENDAR CHRONOGRAPH WRISTWATCH WITH MOON PHASES, 24 HOURS AND LEAP YEAR INDICATION, MADE IN 1987 | Important Watches | 2020 | Sotheby's
![Patek Philippe Perpetual Calendar chronograph 18 ct gold manual winding Kal. CH27-70/Q Ref. 3970/2 | 2203229 Patek Philippe Perpetual Calendar chronograph 18 ct gold manual winding Kal. CH27-70/Q Ref. 3970/2 | 2203229](https://pics.zeitauktion.com/2022/2203229_sw6_front_2k.jpg)
Patek Philippe Perpetual Calendar chronograph 18 ct gold manual winding Kal. CH27-70/Q Ref. 3970/2 | 2203229
![Reference 3970EP-046 'London Edition' | A limited edition platinum perpetual calendar chronograph wristwatch with moon phases, Circa 2015 |百達翡麗3970EP-046 型號'London Edition' | 限量版鉑金萬年曆計時腕錶備月相顯示,約2015年製 Reference 3970EP-046 'London Edition' | A limited edition platinum perpetual calendar chronograph wristwatch with moon phases, Circa 2015 |百達翡麗3970EP-046 型號'London Edition' | 限量版鉑金萬年曆計時腕錶備月相顯示,約2015年製](https://sothebys-md.brightspotcdn.com/06/75/e4284ce94eb59ae72cc77dd856ad/n11058-c8j57-withaccessories.jpg)