The Rolex guarantee has been changed and upgraded over the course of its history, with early examples featuring a punched guarantee in paper format featured in various dimensions. Rolex guarantee features a three-digit code signifying its country of origin and issuance as well as a punched serial number matching the case number of the timepiece. Furthermore, it is usually stamped by the authorized retailer at the time of its sale with a date of sale and sometimes also featuring the owner's name. However, in 2006, Rolex disregarded the use of paper guarantees and opted for a new guarantee card, sized to the dimension of a credit card. The new guarantee card consists of the following information:

1. Three-digit country code
2. Reference number
3. Serial number
4. Model
5. Name and Address of Official Rolex distributor
6. Name and Address of Buyer
7. Date of Sale

The present Rolex Datejust ref. 16238 from circa 2001 with a Lapis Lazuli dial embraces an unusual feature. With a matching and corresponding serial number of the watch printed on a Rolex guarantee card, the date of sale indicates 7th December 2008. With a correct country code "410" indicating it as a watch distributed by a Japanese authorized distributor of Rolex, the retailer most likely requested for a new guarantee card replacing its old paper format when the watch was sold 7 years after the production of the present timepiece.

Offered in excellent overall condition, the present Rolex Datejust ref. 16238 with a lapis lazuli dial set with diamond indexes is complete with its original guarantee and presentation box.