The issue number for a Maestro brand credit or debit card is typically on the front of the card, in the lower right quadrant, labeled by the word "Issue" or "Iss." It is a one to three digit number.
Not all Maestro cards have issue numbers. It is dependent on what bank issued the card. Some cards feature start dates instead of an issue number.
The Maestro brand, launched in 1991, is one of several brands of credit and debit cards owned by the international electronic payments company MasterCard, founded in 1966. Maestro was the world's first entirely online point-of-sale debit network.