The Patek Philippe reference 5125 is one of the manufacture's most desirable commemorative Annual Calendar watches, created in 2000 to celebrate the 150th anniversary of the renowned Milanese retailer Gobbi Milano. Produced as a limited edition of just 500 pieces across four precious metals, the 5125 combines the innovative Annual Calendar complication with a distinctive asymmetrical dial layout that immediately sets it apart from other references in the collection. Powered by the automatic Calibre 315 S QA, it displays the day, date and month together with moon phases, demonstrating the practical ingenuity of the Annual Calendar mechanism first introduced by Patek Philippe in 1996.

Beyond its technical significance, the reference 5125 is celebrated for its rarity and historical importance. Its beautifully sculpted case, applied Breguet numerals and balanced dial design reflect a harmonious blend of traditional craftsmanship and contemporary styling, while its limited production has ensured enduring appeal among collectors. Although mechanically related to the pioneering reference 5035 and later Annual Calendar models such as the 5146 and 5396, the 5125 stands apart as a commemorative masterpiece, representing one of Patek Philippe's most successful special editions and an important milestone in the evolution of the Annual Calendar collection.