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The code is simple, the first two letters are the revision, where AA is the first revision, AB is the second, etc.The next one or two numbers are the month where January is 1 and December is 12. Example: AB763 = second revision, July, 1963 AA1070 = First revision, October, 1970 Misc Dating Info: Silver face amps with the aluminum trimmed grilles are from 67 or 69.

From July 1969 to December 1983, the date letter was put after the serial number.

Older amps are also fairly easy to date using the serial number.

First use the cosmetic features to get a range of possible years.

Next, (if applicable) look for the date code on the tube chart.

If your amp dosen’t have a date code, flip the amp upside-down and check the transformers, and speakers for their manufacturer codes.

If possible, open up the chassis and check a few of the pots’ and capacitors’ manufacturer codes.

How to read the serial number (1969-1983) Marshall used a coding system that provided (a) model, (b) serial number, and (c) manufacture date.

This (a)(b)(c) sequence began in 1969 and was valid through 1983.

The fist Master volume controls were first installed in 72.

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