Patek Philippe Annual Calendar (Ref. 5146J-010) is a masterpiece of horological sophistication, housed in a 39mm yellow gold case with a refined grey dial and Arabic numerals. This elegant timepiece features Patek’s renowned annual calendar complication—automatically adjusting for months with 30 or 31 days—along with a moonphase and power reserve indicator. Powered by the automatic Caliber 324 S IRM QA LU with a 45-hour power reserve, it is paired with a classic brown crocodile leather strap and yellow gold fold clasp. In very good condition with original box and papers.