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.
These include: Link To US Site designed and maintained by Edward Cullen.
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.
This section is the basis of the site and so far it seems to be working!
By creating a database to store facts about Tokai guitars, we have been able to thus far break the serial number dating code for Gibson copies.