1960s rare Rolex watch. Oyster Speedking

My father was a collector of the finest things. He passed away,we have been going through his collections. I just came across his watch collection. He had very good taste. My mother told me the story of the watch ( I won't bore you with it :) ) Please do the Math he passed at 90 last year, so i know he was in the error of when watches for men were smaller not like todays fashion which you will find a Rolex to be huge lol. It stick ticks It was bought in Switzerland in 1960.