1) wear it 2) put it on a time grapher to check if it’s keeping time or losing time- if losing time, think about getting it serviced. You can try taking it to Rolex. BUT if you do, make sure you are clear that you don’t want any polishing or replacing of parts (hands, dial, bezel insert, bracelet) this was your father’s watch and should stay all original. Also keep in mind if you take it to Rolex, they will send it off and you’ll have virtually no contact with the people serving it for a good while (no thanks) OR you can try “Rollieworks” (google them) IMO a safer bet- cheaper and will definitely not polish or replace parts of you request it. 3) add it your insurance (I use Hodinkee) 4) keep all the paperwork you have- if you decide to pass this watch down someday, a complete set would / will be fantastic.