The Day-Date, a popular watch with over 6 decades of history, began with ref. 6510 and 6511 in 1956. These legendary watches were the first to display the date and day of the week, and came with the "president" bracelet. The 18xx series followed in the 1960s, featuring the new 1555 caliber and improved movement. The 18xx also introduced several bezel and bracelet textures, including the "bark" finish and brushed texture. Dial configurations were almost infinite, with over 80 models and over 20 languages.
In 1977, the Day-Date was updated with a new 3055 caliber and sapphire glass, introducing a quick-set date. The Oysterquartz was introduced in the late 1980s to late 1990s, with a unique design resembling the Rolex 5100. The Day-Date 182XX was introduced in 1988, featuring a double quickset function. In 2000, the 6-digit Day-Date President watches with references 118XXX were introduced, with modifications mainly on the bracelet and clasp.
In 2008, the Day-Date II was released with a 41mm case, which was later replaced by the Day-Date 40 in 2015. Despite changes in the Rolex catalog and steel models, the Day-Date continues to make greats in popular culture and will forever be an icon.
The reference, being 18239, means that this Day-Date has a double quickset caliber 3155. It also means the watch features a sapphire crystal. When looking at the reference, the last digit tells you what the case material is. The 9 means the watch is white gold. This example also comes with its original papers and box set. The booklets are dated to 1999.
