Identification numbers.' That isn’t to say that your mandolin isn’t from 1917. In most cases, only the upper end instruments were assigned. All numbers are approximates. But not a final verdict.go to 99999.This system is fairly reliable for guitars made from 1953 to 1961. The first digit is the year and the other numbers are production numbers. An ink stamp on the back of the headstock which included either 5 or 6 digits. This makes relying entirely on the physical features of a guitar potentially misleading.Gibson introduced a new pattern when they began producing solid body guitars. Many older instruments may have reproduction or other non-original parts, including a non-original finish.
![]() Gibson Mandolin Lookup Serial Numbers AndInstruments will generally have one or both of these numbers stamped or written either inside the body (generally the case on earlier models) or on the back of the headstock.FONs were Gibson’s way of internally tracking batches of instruments throughout production. Dating a Gibson by Factory Order Number (FON)Gibson has historically used two different alpha-numerical formats to catalog its instruments: serial numbers and FONs (Factory Order Numbers). After 1950, headstocks had uniform thickness. Before mid-1950, most Gibson headstocks were thinner at the top when looked at from a side profile. The reason for this is that there is no reliable documentation from this.The thickness of the headstock, however, is not as vulnerable to modification or replacement. The consistency around this stopped during WWII and resumed in the early 1950s.To complicate matters further, there was sometimes a second letter from 1938 to 1941 indicating the brand (G for Gibson, K for Kalamazoo, W for Recording King) and sometimes even a third letter indicating "Electric" (the letter E). 1902 to 1945 FON Overview Year1 to 7900 (some with letter, some without)From 1935 to 1942, the FON included a letter suffix. A FON usually consisted of a 3-, 4-, or 5-digit batch number followed by one or two other numbers in most cases. Hp cp2025 no driver for mac os sierra1935 to 1942 FON Letter Suffixes YearThroughout the war and even for some time after, each year had its own quirks around FON batch numbers and letters 1942 to 1951 FON Info Year907, 910, 923, 2004, 2005, 7000s (all with banner logo)1100s to 3700s (move from script to block logo)From 1952 to 1961, a consistent letter code resumed, with the letter appearing before the batch number.
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