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Remember, your amp is newer than the newest component.
So if you find pots from late 68 and transformers from early 69 you can be pretty sure your amp is a 1969.
Fender installed casters on some larger amps and cabs beginning in 72.
Orange Graphic - pics and text '70s Thanks to forum member Orange at there's finally some clarity in the Oarnge serial numbers. This is of course of very good way to date your amp.
If it’s a one digit year you need to determine the correct decade of the amp some other way.