![]() The numbers are usually stamped or written on the instrument's back and seen through the lower F hole or round soundhole, or maybe impressed on the back of the headstock.į O Ns for the years 1935-1941 usually consisted of the batch number, a letter for the year and the instrument number. There are three separate groupings of numbers that have been identified and are used for their accuracy. This system is useful in helping to date and authenticate instruments. The F O N may indicate the year, batch number, and the ranking (order of production within the batch of 40). Thus, the older Gibson guitars may have a serial number and a F O N. Gibson's Factory Order Numbers were an internal coding that followed the group of instruments through the factory. In the earlier years at Gibson, guitars were normally built in batches of 40 instruments. In addition to the above serial number information, Gibson also used Factory Order Numbers (F O N) to track batches of instruments being produced at the time.
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