My guitar has a tan label, and it says "Nippon Gakki", and it also says "made in Japan".
Also, as far as the serial number inside the sound hole, the number is only 5 digits.
The EIA assigns each manufacturer a three-digit code (there are some with one, two or four digits).
I've read where they were manufactured from 1968 thru 1974.
I've read about red labels, tan labels, and how production was shifted to Taiwan in 1972 and red labels were changed to tan.
Stamped on every potentiometer (volume and tone pots) is a six- or seven-digit source code that tells who made the pot, as well as the week and the year.
The source dating code is an element of standardization that is administered by the Electronics Industries Alliance (EIA).
If there is one guitar that has become the "gold standard" of guitar synthesizers, it has to be the Roland G-303 guitar.