These are the signatures of
Pietro Nicastro (P.NIC) on the stamps shown before (San Marino 1935)) :
Nicastro FamilyAs in others families (Delnoce, Smillie, Harrison, etc) there were several
Nicastro which were engravers.
Vittorio Nicastro (born 1916) was a prominent Italian engraver. Active between 1938-1980 he engraved many stamps for Italy, Vatican and San Marino.
Vatican 1938 - Printed by Istituto Poligrafico dello Stato-Officina Carte Valori
Engraved by
Vittorio Nicastro - Designed by Corrado Mezzana

Spain - Banknote 500ptas. - 1940
Printed by Calcografia & Carte Valori - Milano - Italy
Engraved by
Vittorio Nicastro

Don Juan de Austria
Pietro Nicastro (1907-1976) was the eldest brother of Vittorio. He began working in Italy but emigrated to Argentina in 1948 remained there for the rest of his life.
Argentina 1955 - Mount Fitz Roy
Printed by Casa de Moneda de la Nación
Engraved by
Pietro Nicastro
Giorgio (Jorge) Nicastro (1935-2016). Son of Pietro. He came with his father to Argentina in 1948, and was a successful engraver of stamps, banknotes and coins.
Unfortunately Giorgio Nicastro passed away few weeks ago (February 5, 2016)
Argentina - 1958 - Liberty and Democracy
Printed by Casa de Moneda de la Nación
Engraved by
Giorgio Nicastro
Argentina - $500 Banknote - 1980's
Printed by Casa de Moneda de la Nación
Portrait of San Martin engraved by
Giorgio Nicastro
