百达翡丽，18K白金自动上弦万年历腕表，配月相、24小时及闰年显示，型号3940G-013，约2001年制，附原厂证书、额外底盖、转动盒子及外包装

Reference 3940 is the quintessential perpetual calendar and undeniably amongst Patek Philippe's greatest classics. Launched in 1984 as replacement for reference 3450, it was at the time the slimmest automatic perpetual calendar wristwatch.

The model was available in yellow, pink and white gold and platinum. All case versions but platinum were available with both solid and glazed back.