Gents Patek Philippe Advanced Research Annual Calendar in 18k white gold, Ref# 5250G-001, circa 2005-2007. Limited to 100 pieces. On the original reptile strap with an 18k white gold deployant buckle. Smooth bezel with a sapphire crystal. Case diameter is 39.5 mm. Sapphire display caseback with magnifier over a silicon escape wheel and printed with “Patek Philippe Advanced Research”. Self-winding movement with an annual calendar featuring day, date, month, and moon-phase. Power reserve indicator. Silver dial with applied black hour markers and Arabic numerals. Luminescent filled hands. Box, presentation box with the case and movement numbers, plastic sleeve with the barcode and hangtag, service papers dated December 2017, and Extract of the Archives detailing production and sale in 2005. Very Good condition.