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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.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.
(After 5 9999 came 510 000) Evidently the production was high in 1956 because "6 9999" is exceeded.
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).
1935-1937: Letter between the batch number and the order number. 0123 A5 1938-1941: Two or three letters before batch number. If there is a second character follows it is the code for the type of the instrument.
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.