This attractive issue was designed by E.Pizzi and consisted of three stamps 10l. yellow, lake and seoia, 25l. yellow lake and dull violet and 35l. yellow, lake and grey-black (pictured). It was released May 29, 1954.180px-Vatican_City_1954_Canonization_of_Pope_Pius_X_cFor information on Piux X, see the Catholic Encyclopaedia entry:

http://www.newadvent.org/cathen/12137a.htm