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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.
You should be able to find a number stamped somewhere on the speaker’s frame.
The format may look like this: 220 637 Here the number 220 designates the speaker as a Jensen, and 637 indicates a production date of the 37th week of 1956 or 1966.
Most post tweed Fenders had trannys manufactured by Schumacher.
They used a code like this: 606 – 645 The date is in the last three digits, after the 606 – .
There are some easy ways to find out when your vintage Fender was manufactured.