Kitarat: kitarakamat ›

Tämmöinen PDF-filee löytyi myös:
 
http://www.bluebookinc.com/staticin … kinc/pdf/eguitar/eserialization.pdf
 
Sieltä löytyi jotain Yamahasta:
 
"YAMAHA SERIAL NUMBERS
Yamaha instruments were originally produced in Japan; production
switched to Taiwan in the early 1980s. Instruments are currently produced
in the U.S., Taiwan, and Indonesia. It is important to recognize
that Yamaha uses two different serialization systems.
Yamaha electric guitars and basses have a letter/number (2 letters followed
by 5 numbers) code that indicates production date. The first
two letters of the serial number indicate the year and month of production
(the first letter indicates the year, the second letter indicates
the month). Yamaha’s coding system substitutes a letter for a number
indicating year and month, thus:
CODE LETTER MONTH or YEAR NUMBER
H 1
I 2
J 3
K 4
L 5
M 6
N 7
O 8
P 9
X 10
Y 11
Z 12
For example, an "H" in the first of two letters would be a "1", indicating
the last digit of the year (1981 or 1991). An "H" in the second of
two letters would also be a "1", indicating the first month (January).
Like Hamer, the digits will cycle around every 10 years.
After the two letter prefixes, 5 digits follow. The first two digits represent
the day of the month, and the three digits indicate the production
ranking for that day. For example:
NZ19218 December 19, 1987
(or 1997); #218.
The example’s code should be properly broken down as N - Z - 27 -
428. The "N" in the first of the two letters would be a "7", indicating
the last digit of the year (1987 or 1997). The "Z" in the second of the
two letters would be a "12", indicating the 12th month (December).
The two digit pair after the letters is the day of the month, the 19th.
The final three digits indicate production ranking, therefore this imaginary
guitar is the 218th instrument built that day.
Yamaha Acoustics and Acoustic Electrics contain 8 digit serial numbers.
In this coding scheme, the first digit represents the last digit of
the year (for example, 1987 = 7); the second and third numbers indicate
the month (numbers 01 through 12); the fourth and fifth numbers
will indicate the day of the month, and the final three digits will
indicate the production ranking of the instrument.
This system works for most (but not all) of Yamaha products. If a
serial number doesn’t fit the coding system, Yamaha offers internal
research via their website (www.yamahaguitars.com) - just email your
request in."