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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.
The electrical models were provided with a rectangular with black and purple triangle.
It was also from 1970 "MADE IN USA" stamped on the back of the headstock.
Guitars got six digits in any order, and in some cases they were preceded by a letter that none seemed to have no smeaningful sense.
Note that the series of between 19, may be an overlap from production in 19.
Factory Order Numbers (FON) with a letter from 1935 to 1941.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.In a random sequence numbers were stamped on the back of the headstock. In 1970, the orange labels in the body of acoustic guitars were replaced by white with orange rectangular labels.Gibson has used various methods of numbering from 1900, so it is not simply based on the serial number to identify the year of manufacture..
From 1902 to 1976, Gibson instruments have a serial number or a FON (Factory Order Number) or both.FON consists a batch number of usually four digits, followed by a one letter (sometimes prefixed by a space) followed by one or two digits (ranking).