From until Marshall amplifiers were identified by a four-digit sequential number inside the back panel, reportedly starting with in and reaching at the beginning of While there are serial-like numbers during this era, no standard serial number format has been identified. The model numbers can be somewhat confusing because model numbers such as or can be mistakenly interpreted as the production year of the amplifier. Amplifiers from this era must be dated within this time span based on their features, or component manufacturers and codes, including speakers, potentiometers and transformers. JTM block logos changed to gold-plated plastic script, these are fragile and many have been replaced.
In , Marshall started using both model codes and serial numbers, which are listed here. Marshall exclusively used Celestion speakers in their amps, and if the. Below is a compilation of Hammond organ serial numbers and dates submitted by owners and other interested folks. There are discrepancies here, so be.
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