How special is the Rolex Vademecum collection?

[Absenta]

My grandfather, who had a deep passion for watches and history, recently passed away. While going through his belongings, we found several books related to Rolex, including what seems to be a collection titled Rolex Vademecum (Volumes 1, 2, 3, and 4).

The books are in good condition and appear to be quite technical, but I couldn’t find much information about them online.

Could anyone tell me if this collection holds any special significance or if it’s something common among collectors? I’m exploring its history before deciding what to do with them.

I’d appreciate any insight or context you can provide.

Best regards,
Absenta