Unfortunately, once again, records of Guild serial numbers before 1960 are at best sketchy, preventing us from being able to assure dating accuracy before that 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.
Also in 19 there was a high production, "9 9999" is exceeded for "932 000" or higher.
Therefore, the production in 1959 may be a "1", "2" or "3" in the second digit.
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.
Some instruments from the fifties also had been such a stamp. At serialization in the 70s a random method was used.
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.
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.
Please refer to the notes preceding each chart on how to best interpret the data.