For identification, all the P ones are Perthshire, the bird is a Chinese weight and the others are Caithness.For the Caithness paperweights, it is best to buy a copy of Charltons 2nd edition by Colin Terris, which you can buy on Amazon.Actual value depends on the condition the weights are in, whether they have any scratches, chips, or bruises - and also whether they come with the original box and c