So the 6 & 7 digit serial numbers must not be related to date the guitars were built.That didn’t work for a few guitars I found.I’ve read the first digit in the serial number is the year, then a 2 digit month, 2 digits for the day, and the rest is a unit number.What got me started was a curiosity of what the early (1966-71) Japan built FG 6 & 7 digit serial numbers meant. This article will be updated as I find further information. They don’t always agree with Yamaha’s Guitar Archive data. The facts presented are based on personal observations, data collected, and data donated. I’ve been collecting data and in most cases can tell when a guitar with a 6 or 7 digit serial number was made (within a month or so). Yamaha doesn’t know exactly when the earliest FG’s were made. And to be able to fairly accurately determine when they were made. The purpose of this article is to solve the mystery of the early Yamaha FG serial numbers, internal markings, and labels. I'm up to 2600 serial numbers and 400 date codes. Without them this project is meaningless. I'd like to thank anyone who's donated their serial numbers and/or date codes.
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