Rolex Datejust 26mm Silver 10 Diamonds Jubilee 179173 2013 [Preowned]Overview The 179173 Lady Datejust was the reference Rolex ran for the better part of two decades before the 279173 update modernized the case geometry and introduced Calibre 2236. The 179173 is the 26mm iteration a case size Rolex has since moved to 28mm with the current generation in silver with diamond markers on the Jubilee bracelet. For buyers who prefer the older generation's proportions, or want the Lady Datejust at a meaningful step below