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Fender installed casters on some larger amps and cabs beginning in 72.
latest updates; small changes to a few amp batches dates, Dec 2015, Feb 2016, July 2016, Sep 2016, March 2017, Feb 2018 small changes to 4 amp batches, Nov 2015 typos found, two edits, thanks Ben H, June 20 info updated, totals unchanged Oct 2014 really nifty table design Aug 2014 small data and totals updates Jan 2014 (info updatedthe website I developed for this amp's care and feeding, .
Here is a cool link to a Vintage Fender Amp price history chart that tracks sales data for specific amp models by the month.
Date Code: Wide panel, narrow panel, brown, blonde, and black face amps have a date code hand-stamped on the tube chart. The first letter translates to the year and the second to the month. Example: FG=July 1956, QA=January 1967, and a reissue CG=July 1992 EIA Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stampted with a date code indicating who manufactured them and when.
The next one or two numbers are the month where January is 1 and December is 12. Example: AB763 = second revision, July, 1963 AA1070 = First revision, October, 1970 Misc Dating Info: Silver face amps with the aluminum trimmed grilles are from 67 or 69.
The fist Master volume controls were first installed in 72.
Next, (if applicable) look for the date code on the tube chart.
The code is simple, the first two letters are the revision, where AA is the first revision, AB is the second, etc.
The raised “Fender” grille logo lost its tail around 76.
There are exceptions to this rule like the the Bronco.
Then I became aware of the amazing work Greg Gagliano had been doing since the 1990s - the summary of his latest results are here - and that his research didn't take in the Rivera-era, or anything later. However for this range of amps at least, I reckon it's not just a policy of withholding company-confidential information. It's no criticism of Fender to suggest that they were too busy making great amps to keep records just so some amateur could use them thirty years later.
I run a couple of websites making the schematics for these amps easily accessible.