First Rolex (Questions!)

[LittleOmid]

Hello!

6 years have passed since my grandfather passed away, but his Rolex Datejust has been in the safe for the time and now it's been given to me. I am 19 years old and have always been interested in quality watches. What I could afford till now was a Certina stainless steel, nothing too fancy but my problem is that in the last 2 years it's going approximately +-20 seconds a day which is quite irritating. Now I plan to wear the Rolex as my every day watch.

Pictures are included, and tomorrow I'll take it to a Rolex dealer in the city to get the bracelet a little bit smaller for my wrist.

I believe that the watch is almost 55 years old, however I would love some information on it from you people. I've been told that it's a two tone of white and yellow gold, and it's been bought in Switzerland around 1960s.

Here are some pictures:






Sorry for low quality, I'm in a low light situation right now. It's practically night around here after 16:00.

There is also a scratch at between 7 and 8, I tried to capture it on the last picture but it's not overly visible to naked eyes.

So forums, what info can you give me on this watch? I don't plan on selling it for it's sentimental value, but i'd love to know when it was made and what model of Datejust it is.

Thanks in advance!