Dating a vox amp application to dating my daughter
Marshall used letters as a date code to represent year of production.It's important to note that, prior to 1984, this letter came last.For example, the number S/A 8481 E tells us that this is 50W amp (S/A) made in 1973 (E), production number 8481.From January 1984 to September 1992, the three-part coding was used by Marshall but the date code letter was moved from the end to the middle. This would indicate a 100W Super Lead (SL/A) built in 1989 (X), production number 10059.
It's also one more piece of evidence to pair with the serial number to corroborate the actual year.
Before we begin, a few caveats: The best approach is to cross-reference the serial number with known features for the model during different eras and the personal account of previous owners.
Getting the correct year is one thing, but getting the story behind an amp is the fun part.
For models made between 1979 - 1981, the serial number will be on the front panel.
Keep in mind that no reliable serial number information exists for pre-1969 Marshall amps, so if your amp doesn't have a number matching one of the formats below, it is likely pre-1969 and identifiable by features rather than serial number.
From January 1965 to June 1969, model codes were used but no known serial numbers accompanied them.