How do I find out more info?Silver salver now hav pics!

Hi, I recently bought a silver salver - approx 14 inches in diameter, with feet (4). I have Identified the maker as Thomas Bradbury & Sons ltd. The Salver has the number 7950 stamped above the hallmark - what is this mark is it a pattern number, and if so where can I find more info about it ? also where can I find out what my salver could be worth? :smiley: :question: