On the occasion of the 450th anniversary of the birth of Galileo Galilei (1564-1642), the Ufficio Filatelico Numismatico of the Republic of San Marino dedicates to the revolutionary scientist 2 stamps of € 0.70 in order to honour his memory, the deeds and the extraordinary self-denial by which he immolated himself as master of reason and prepared the ground to the modern science.