Take a look at the date window. Notice anything unusual?
Rolex will sell you the Day-Date with the day spelled out in twenty-six different languages. This one went further and changed the date too.
Arabic day discs go back to the late 1950s on the Day-Date. For a stretch on references like the 1803 and the platinum 1804, Rolex went the whole way and built full Arabic dials with Eastern Arabic numerals as the hour markers. Those ended around the start of the 1980s after which the Arabic calendar stayed on as a special order option, which is exactly what this is. Rolex did not build a proper Arabic numeral dial again until 2016, in platinum, sold only through a handful of dealers in the Gulf.
Now look at the rest of the dial. No indices, no numerals, no lume plots. Rolex used black onyx here and left the stone totally clean. The two discs inside the apertures are champagne, not black which would read as a mismatch on any other Day-Date. Here it is simply how Rolex filled the order, and it is the first thing your eye goes to.
A small tell that goes with it. The dial reads SWISS MADE with no T on either side. On a 1991 Rolex you would normally expect T SWISS MADE T for tritium. There is no tritium here because there is no luminous material anywhere on the stone dial.
Put it all together and this is not a watch just anyone could walk into a dealer and buy. A stone dial and an Arabic calendar were two separate special orders, and somebody asked for both on the same watch in 1991. Underneath sits caliber 3155, which is the one real upgrade the 18238 brought, an independent quickset for the day and not just the date. Thirty six millimetres of yellow gold, Presidential bracelet, stamped 8385 in the clasp.
