old rolex needs identified

Hello other watch heads. I am trying to get a value and some info on an antique rolex wrist watch that has been sitting in my cupboard since 1987. All that I know so far is that it is 18c gold and was imported into glasgow in 1928. It is an oblong shape and has a second hand just above the No 6 on the face. It is in fab condition as it was fully refurbished in 1991 to the original finishes and had mineral glass fitted. on the back of the case it has 57912 stamped on it at the bottom and below this it has 914 stamped on it. Would be greatful if any one could inform me what the model is or any other interesting info or indeed where i might get some difinitive info on it. contact me if you need more info to answer the questions
cheers