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The very first Day-Date references, the reference 6510 (with a domed bezel) and reference 6511 (with a fluted bezel) were introduced in 1956. They were produced for a single year before being fitted with an upgraded movement. The next generation, references 6611, 6612, and 6613, contained an upgraded version of the calibre 1055.The upgrade included a new balance wheel with microstella regulating screws. The new movement received a certification from the Official Swiss Chronometer Testing Institute (C.O.S.C.). On this references we see the text 'Superlative Chronometer Officially Certified' for the very first time on a Day-Date. The previous ones had 'Officially Certified Chronometer' on the dial.This is a unique example of the Rolex Day-Date: the reference is 6611 B, which is already quite rare. However, what truly makes this watch special is that there are only six known in 18k white gold and two without lume. It has an Italian day disc and we can only imagine what kind of stylish Italian gentleman walked in the Rolex boutique in the fifties and requested this gorgeous wristwatch. This Day-Date has a very classic configuration with a silver pie pan dial, an 18k white-gold index and dauphine hands. It comes on a leather strap with an 18k white-gold Rolex buckle. The previous owner certainly did enjoy this watch but it remains in excellent and most importantly, original condition.