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The very first Day-Date references, the reference 6510 (with a domed bezel) and reference 6511 (with a coin-edge bezel) were introduced in 1956. The 6510 and 6511 had the caliber 1055. Due to deficiencies this movement didn't build up enough power reserve to switch to the next day at midnight. Therefore, both references were produced for a single year before being fitted with an upgraded movement making both very rare and desirable. This Day-Date has a very classic configuration that we absolutely love: a gold, patinated pie pan dial, an 18k yellow-gold, elegant index and 18k yellow-gold alpha hands. The dial is protected by a plexi crystal. A few details we fancy are the coin-edge bezel, which is an old style of fluted bezel, and the red date disc. Crème de la crème is that it comes on an 18k yellow-gold Jubilee bracelet.