External view of the Este Castle in Ferrara. Name of the engraver on the right side.

The Castello Estense (‘Este castle’) or castello di San Michele (‘St. Michael's castle’) is a moated medieval castle in the centre of Ferrara, northern Italy. It consists of a large block with four corner towers.

Partially inside a big dotted circle, a particular from a fresco of the "Salone dei Mesi" inside the Schifanoia Palace. The fresco represents the zodiac sign Taurus as taken from the representation of the month of April. April is depicted as a young man seated above the constellation (above the stars is depicted a bull, with a radiant sun below) holding a big key in his right hand. Inside the dotted circle is present also the value, the date and the mintmark.