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The Patek Philippe World Time reference 2523, launched in 1953, is distinguished by its innovative two-crown system. One crown serves for winding the watch, while the second, positioned at 9 o’clock, controls the city disc. This design marked a significant development in the functionality and user experience of world time complications for the brand.

The reference 2523 was offered in two primary versions. The initial ref. 2523 featured larger lugs that extended above the bezel, with a case diameter of 35.5 mm. A subsequent variant, ref. 2523/1, presented a slightly larger diameter of 36 mm and thinner lugs that were integrated without extending above the bezel. Both versions were powered by the caliber 12-400 HU, which incorporated the world time module developed by Louis Cottier.

This reference appeals to collectors interested in Patek Philippe's historical advancements in complicated watchmaking, particularly the evolution of its World Time series. The distinct design differences between the 2523 and 2523/1, especially regarding lug integration and case dimensions, provide specific points of interest for enthusiasts tracking the model's development and variations.

The A110 reference represents a specific offering within the Alpine product line, known for its distinct design characteristics and manufacturing period. This model is recognized by collectors for its particular aesthetic, which sets it apart from other references in the brand's history. Its production run concluded in the late 1970s, marking it as a piece from a defined era of the manufacturer.

Details regarding the case material, dimensions, and the specific movement caliber are integral to understanding the A110. The construction of the case and the type of crystal used contribute to its overall presentation and durability. The movement, whether automatic or manual, and its power reserve are key technical aspects that define its functionality and appeal to enthusiasts.

For collectors, the A110 holds significance as a reference that is no longer in current production, with the last modern examples having been phased out of the catalog. The scarcity of these pieces, particularly those from the final production years, contributes to their appeal in the secondary market. Its place in the brand's lineage offers insight into the evolution of Alpine's design philosophy.