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If the stamped number consists 5 digits, there is a space between the first and second digit (a separation between the last digit of the year and the actual serial number).When a six-digit serial number is concerned, there is no space, because the highest number in four digits (9999) has been exceeded and so fills the space. In 1955, Gibson forgot to put back the serial number range to 0001. For this reason, the array of four-digit serial number was exceeded after 9999.The three intermediate digits, the day of that year. After opening of the new factory in Nashville, in the sequence numbers were also included the production site.001 to 499 appeared on the instruments built in Kalamazoo, 500 to 999 built in Nashville.The electrical models were provided with a rectangular with black and purple triangle.
The batch number, the first four digits of the FON, followed by a one or two-digit number. The first digit of the serial number is the last digit of the year.
Some instruments from the fifties also had been such a stamp. The same confusing six-digit serial system of the sixties was maintained until 1975.
This means that instruments with the same serial number can be from the 60s or 70s.
The table below shows the years in which the numbers could relate. The most sustainable numbering system Gibson was launched in 1977, an eight-digit number.
The first and fifth digit representing the year of manufacture.