Old days Greco hasn't got any serial numbers. When Matsumoku　made all Greco guitars, they didn't put any serial numbers on the body. After thatm they started
the serial number format.

1st format is the letter that (may) begin the serial number corresponds with the month of production, and the next 2 digits tell the year.

For example: A794520 would be a Jan. 1979 and #4520 production




A Jan.
B Feb.
C March
D April
E May
F June
G July
H August
I Sept.
J Oct.
K Nov.
L Dec.

They started the second format is Yxxxx.

Y = year (9=1989 0=1980 or 1990).
xxxx = production number.

GRECO Guitar Serial Number