The Patek Philippe Perpetual Calendar Chronograph 5270G-013 41mm White gold Silver (Ref. 5270G-013) is a luxury mechanical wristwatch. On the secondary market, the Perpetual Calendar Chronograph 5270G-013 41mm White gold Silver averages $117,443 across 1 active listing. When buying pre-owned, check condition grade, box and papers (typically a 10–20% premium), service history, and originality of dial and hands. Use the listings and price history on this page to benchmark fair market value.