Dating early Fender amplifiers is sometimes quite challenging.
While dating Fender amps made before 1994 by serial number is all but impossible (as records of these numbers were never kept), all hope is not lost—the charts below should prove helpful in dating your Fender amp.
This (a)(b)(c) sequence began in 1969 and was valid through 1983.
How to read the serial number (1984-1992) In 1984, the order of the serial number components changed to (a)(c)(b), but the method used to determine the values for (a) and (c) remain the same.
In 1981, Marshall finally reached the end of its 15-year distribution deal with Rose-Morris, which had severely limited its potential to sell amplifiers outside England; Rose-Morris tagged 55% onto the sticker price for exported models. M.", coupled with the meaningless "800" from the number plate on his car.
The JCM800 was the first series produced after the contract expired. It was later noted that "800" stood for the decade.
The sound of this amplifier is “creamy” and “warm”. This amp is more suited for blues players, with a smoother sound.
This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing.
The final line contains a date code of two printed or handwritten letters denoting the amplifier’s production date by year (the first letter) and month (the second letter).
Marshall amps began featuring aluminum back panels in 1969.
Serial numbers began appearing on the back panels in July 1969.