04-11-2011, 02:50 PM
(04-11-2011, 01:41 PM)brettyboy link Wrote: So I actually now believe it is a J-50. I am still trying to find out the year for sure.
Gibson's F O N System
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. In the earlier years at Gibson, guitars were
normally built in batches of 40 instruments. Gibson's Factory Order Numbers were an internal coding that
followed the group of instruments through the factory. Thus, the older Gibson guitars may have a serial
number and a F O N. The F O N may indicate the year, batch number, and the ranking (order of production
within the batch of 40).
F O Ns for the years 1935-1941 usually consisted of the batch number, a letter for the year and the
instrument number.
Code Letter and Year
A 1935
B 1936
C 1937
D 1938
E 1939
F 1940
G 1941