In 1983 Rolex introduced the 26mm Lady-Datejust 69XXX in a number of different metals options and a wide variety of dial, bezel and bracelet combinations.
With Rolex their numbering system you can again tell by the number which material is used, if it has a fluted or smooth bezel and so on.
It houses the 2135 movement and has an incredible level of performance and measures only 20mm x 5.83mm and has the easy to use Quickset function, to set date the independently of the hour hands.
The most classic and sought after 26mm Rolex Lady-Datejust is a 18k yellow gold watch with matching champagne face, 69178. But don't forget the much more subtle 18K white gold 69179 or the extra ordinary tridor 69179b.