Dating old fender amps
However it’s unlikely that the transformer found its way immediately into production, so it’s a pretty sure bet that the a 1975.
It could be that another transformer reads 606602 which would make that component a 1976 make, thus the earliest the amp could be is a 1976.
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Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.
The original Fender amps were tube-powered and the company also started producing solid-state models in the late 1960s.
Most of the amps were finished in a "gray crinkle" finish.
They are all very rare today and few have survived.