Marshall Serial Numbers

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Marshall has used three serial number systems since 1969.

Marshall amps began featuring aluminum back panels in 1969. Serial numbers began appearing stamped on the back panels in July 1969.

Note that some models produced from 1979-81 had serial numbers stamped on the front panel (to the left of the power switch).

1969-1992

Marshall used a coding system that provided (a) model, (b) serial number, and (c) manufacture date. This sequence of (a)(b)(c) began in 1969 and was valid through 1983.

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) remains the same.

The first part of the serial number grouping determines the model of the chassis.

 

Code

Model

A or /A

200 watt

RI

Reissue Series

S/ or S/A

50 Watt

SB/ or SB/A

Super Bass – 100 Watt

SL/ or SL/A

Super Lead – 100 Watt

SP/

Super PA

ST/ or ST/A

Tremolo – 100 Watt

T/ or T/A

Tremolo – 50 Watt

 

(b) Serial number – The second part of the serial number is the five-digit serial number itself.

 

(c) Manufacture date – The last character determines the date of manufacture. Since A was used in both 1969 and 1970, Marshall decided that 1971 would start with C. To avoid confusion with the numerals 1 and 0, Marshall elected to skip the letters I and O. Also, for reasons not explained, there are no Q-dated amps. Z was used for two years. Here are the date codes:

Date Code

Year

A

1969-1970

C

1971

D

1972

E

1973

F

1974

G

1975

H

1976

J

1977

K

1978

L

1979

M

1980

N

1981

P

1982

R

1983

S

1984

T

1985

U

1986

V

1987

W

1988

X

1989

Y

1990

Z

1991-1992

1992-Present

After 1992, a bar code system was introduced.

 

1 Comment on Marshall Serial Numbers

  1. I have a 1988 and a 1990 Marshall JCM 800 2210. They are 100 watt heads. The serial nos. both start with “S/A”. Every Marshall serial no. dating key is wrong in designating “S/A” as a 50 watt amp. Wrong. It’s a 100 watt amp.

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