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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.
Gibson stopped the stamped serial numbers at the end in 1960, although there are a few guitars made in 1961 with a "1" as a prefix.
Some lap steels and Les Paul's from 1961 have such a serial number.
Exceptions: Some high-end models and lap steels from 1939-1940 have been added the letter A, to the prefixes D, E or F.
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.
Thence 5 digits and no space between the year (5) and the serial number.
(After 5 9999 came 510 000) Evidently the production was high in 1956 because "6 9999" is exceeded.
However, in the beginning this was not done consistently, so that there are also be instruments without identification.
Where to find the serial number The serial number is stamped or punched on the back of the headstock or acoustic in the sound hole.
Another exception to the above rules is in the autumn from 1958, where a some Les Paul Juniors and Specials had a four-digit serial number. From 1970 to 1975, the 6-digit serial numbers randomly generated.