bluegrass music in the late 1940" s="" and="" 1950's,="" most="" likely="" due="" to="" the="" volume="" growling="" tone="" they="" produce="" when="" used="" with="" driving,="" 3-finger="" picking="" style.="" ever="" since,="" pre-war="" gibson="" flathead="" banjo="" has="" been="" axe="" of="" choice="" for="" bluegrass="" player.
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1947 to 1961. Once the serial numbers hit 99999, Gibson decided to change to a new system, rather than go into 6 digits. The new system used a letter to prefix the numbers. The first guitar in this new system was A 100 which was in April of 1947. X - ____ (China) - Early to mid 1990's serial number label - Verified by Epiphone Customer Service. Seen on 'Epi' brand guitars. Y - Korea (seen on a PR775CE) Z - Zaozhuang Saehan (China)-----FACTORY NUMBER CODES For some models starting in 2008, if serial begins with numbers.
There have been 6 different serial number styles used to date on Gibson instruments. The first serialization started in 1902 and ran until 1947. The serial numbers started with number 100 and go to 99999.