The stamp shows a detail of the frescoes painted in 1248 inside the hall of the Oratory of San Silvestro in the Basilica of the Santi Quattro Coronati in Rome,

depicting San Silvestro showing an icon with the faces of Saints Peter and Paul to the Emperor Constantine I. The word “ITALIA” and the denomination “€ 1,90” complete the stamp.
The stamp is printed in a perforated box placed at the top in the middle of the sheetlet. Outside of the box continues the reproduction of the fresco with the words “ORATORIO DI SAN SILVESTRO, ROMA – BASILICA DEI SANTI QUATTRO CORONATI” Oratory of San Silvestro, Rome – Basilica of the Santi Quattri Coronati. Along the top and bottom edges are two strips bearing the words “1700° ANNIVERSARIO DELL’EDITTO DI MILANO” 1700th anniversary of the Edict of Milan and “EMISSIONE CONGIUNTA ITALIA – CITTÀ DEL VATICANO” Joint issue Italy – Vatican City.

Source: Italian and Vatican Post

published April 25th, 2013