Our Buyer’s guide to vintage Fender amps explains in detail how you can date your amp by looking at serial numbers, tube charts, transformer codes, speaker codes, Fender logo, etc.
Lots of different speakers were used in the blackface and silverface era Fender amps.
Then the terrible truth dawned on me: they WERE all mixed up; Fender had decided to change their 35-year-old system of serial numbering so that, starting in 1982, every amp had a unique number.
I would have to collect data for ALL the amp types, just to work out how many were made of mine.
Even at we struggle with keeping a correct amp and speaker model overview.