Old Datejust - Any Info?

[ptarmigan]

I was at a friend's house for dinner and mentioned watches. Someone went away and brought out this guy. His dad passed it down to him. Hasn't had a service lately and the bracelet has obviously seen better days.

I can't seem to find similar pictures of the little pearls by the hour markers. Can anyone provide any details about model, age or value? Sorry for the blurry cellphone pics.

Thanks