For your consideration is an unusual and finely made 19th-century Austrian numismatic desk seal, circa 18401870, engraved in mirror image after the reverse of a 20 Kreuzer coin of Emperor Francis I of Austria dated 1826. The seal is constructed with a cylindrical brass matrix body and a contrasting copper knop, measuring approximately 46.7 mm in height, 22 mm in width, with a matrix diameter of approximately 21.9 mm, and weighing 85.51 grams. The metals retain an even age-developed patina, with visible lathe turning to the brass body and a textured, hand-finished surface to the copper handle.

The circular matrix reproduces the characteristic Austrian imperial coin reverse associated with Francis I: a crowned double-headed eagle bearing the dynastic shield and imperial regalia, together with the denomination 20 and the date 1826. Around the eagle is the abbreviated territorial titulature used on contemporary Austrian coinage, including references to Hungary, Bohemia, Lombardy and Venetia, Galicia, Lodomeria, and Illyria, concluding with the formula identifying Francis as king of those territories and Archduke of Austria. The presence of the denomination 20 identifies the numismatic prototype specifically as a 20 Kreuzer issue.

Importantly, the entire design is engraved in reverse, confirming that this is not an actual coin mounted into a handle but a purpose-made seal matrix intended to produce a correctly oriented impression in wax. The use of a complete coin reverse, including denomination and date, indicates that the object was created as a numismatic, commemorative, or presentation desk seal, rather than as an official governmental, municipal, or judicial seal. Its design reflects the enduring prestige of Austrian imperial coinage and heraldry during the 19th century.

Condition is very good overall, with age-consistent patination and minor surface wear. The matrix remains sharply legible and capable of producing a strong impression, while the brass-and-copper construction remains complete and structurally sound. Combining imperial Austrian heraldry, a precisely identifiable 1826 Francis I 20 Kreuzer reverse, and purpose-cut mirror engraving, this is a distinctive and collectible example of 19th-century Austrian numismatic sealing culture.