There are good several books on Scottish weights.
PW554. Salvador Ysart (father of Paul Ysart) Museum Piece. Salvador’s work is often overlooked in the shadow of the more popular works of his talented son Paul. Let us not forget that Salvador is the true father of all Scottish paperweights. His work is far more rare than Paul’s and forms the keystone of a collection of Scottish weights. Identification was made by Robert Hall, author of Scottish Paperweights. This piece is in excellent condition with just minimal wear to the base. 2 7/8 inch diameter; 1 13/16 inches tall; 13 ounces. $250