The Ducat was a gold or silver coin used as a trade coin in Europe from the later Middle Ages until as late as the 20th century. Many types of ducats had various metallic content and purchasing power throughout the period.
The gold ducat of Venice gained wide international acceptance, much like the medieval Byzantine hyperpyron or the modern British Pound sterling. Succeeding doges of Venice continued striking ducats, changing only their name on the obverse.
The Republic of Venice allocated anywhere from twenty to forty thousand Ducats just to keep the Arsenal supplied with over half a million litres of wine per year. This roughly equates to 4.5m British Pounds gold-for-gold.
Due Ducati is our tribute to the Venetian coin which sustained European wine commerce and consumption for centuries.