PATEK PHILIPPE - Fine and rare stainless steel Nautilus with date and moon phase. Provided with full set. Patek Philippe introduced reference 3712/1A in 2005, and it remained in production for approximately one year – some estimate as few as eight months. The first of the Nautilus family was presented in 1976. Reference 3712/1A was at the time of its launch, the most complicated version of the Nautilus made by Patek Philippe, which had previously only indicated the date. With its extremely short production period, the reference 3712 is amongst the rarest of all variants of the Nautilus, making it extremely sought after.