Help needed identifying model

[xanthe]

Dear all, several years ago I inherited a Rolex Tudor Submariner Princess Date, model 9091/0, from my uncle. It is in its original case, has original certificate of authenticity and receipt. It was bought in 1979 for £230. As far as I know it has never been tampered with and has literally sat in its box for years, though it has a few minor signs of usage prior to that. I wound it today and it works beautifully! I would just like some more information on it, including its possible value, as my Internet searches so far have proved unsuccessful. Many thanks,