Patek Philippe reference 3712/1A-001 Nautilus automatic wrist watch, all stainless steel with blue dial, date, moon phase, power reserve on Patek integral bracelet strap. Original polish wooden box, certificate and instructions with setting stylus purchased 2006, "When it was launched in 2005, the Ref.3712 was the complicated model in the Nautilus family, what with the asymmetric indications moon-phase, date, and power reserve indication. However, it was produced only for eight months and was eventually replaced by the Ref.5712 to mark the model's 30th anniversary in 2006., as a result, the overall production output is low and with an estimate of 1,700 pieces having been sold. The production of the 3712 can be divided into two series. On the first series, the power reserve indicator features three small dots while on the 'Second series', the power reserve is indicated by four small red dots. Incidentally, the 'Four dots' is also seen on the dial of the Ref.5712., this reference re-introduced the monobloc case construction seen in the original 3700/001A, but the sapphire caseback was novel and displayed the Cal. 240 PS Irm C Lu."