Day Date questions

[LuminousMaximus]

I was wondering what years and which references came out with the ceramic inserts to minimize wear in the bracelet?

36mm what reference/year?
40mm. What reference/year?
41 mm ref/year?

2nd I heard the new 40 mm has the skeletonized escapement for better accuracy. Did the 36mm and 41 mm with the respective movement get the skeletonization as well?

Historically, the bracelet was composed of gold links containing steel inserts. In the new version, these steel inserts are covered by ceramic sleeves, which raises durability by reducing the wear-and-tear that results when soft and hard metals rub against each other. It may be a minor improvement but one that is proof of Rolex’s commitment to quality. The choice of the two calendar functions was also carefully considered. Wilsdorf had written in a letter a few years earlier that in his opinion the date and day were the two most useful displays because they change daily, so Rolex concentrated on the presentation of this essential information, ensuring they were given pride of place on the