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or embossed bank card number complying with the ISO/IEC 7812 numbering standard.

The card number's prefix, called the Bank Identification Number, is the sequence of digits at the beginning of the number that determine the bank to which a credit card number belongs.

These charge coins were usually given to customers who had charge accounts in department stores, hotels, and so on.

A charge coin usually had the charge account number along with the merchant's name and logo.

They came in various shapes and sizes; with materials made out of celluloid (an early type of plastic), copper, aluminum, steel, and other types of whitish metals.

Each charge coin usually had a little hole, enabling it to be put in a key ring, like a key.

Not all credit cards have the same sets of extra codes nor do they use the same number of digits.

Credit card numbers were originally embossed to allow easy transfer of the number to charge slips.

Because the customer's name was not on the charge coin, almost anyone could use it.The Charga-Plate, developed in 1928, was an early predecessor of the credit card and was used in the U. It was embossed with the customer's name, city, and state.It held a small paper card on its back for a signature.This is the first six digits for Master Card and Visa cards.The next nine digits are the individual account number, and the final digit is a validity check code.

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