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The sticker looks like this, with this one being on the cab, right side as viewed when facing the rear of the amp. I've searched the inside of the amp as best I could and couldn't see one anywhere. I even used my camera with a flash to take pictures of the parts where I can't see!
I have seen them with only two hand written letters, denoting the date of manufacture as detailed on the product info page.
The codes can be handwritten, which can occasionally make the letters hard to decipher. There is no reliable way to date 2003–2005 amps other than to ask Fender customer support to look up the date from the serial number.
Amps made in 2006 have a small metal "Fender 60th Anniversary" button on the back plate. In 2010 Fender updated their line of hot rod model amps and released the "Blues Junior III," adding many physical changes to the standard black tolex model.
Fender frequently releases limited editions of the Blues Junior.
All have the same electronic components and specifications but have cosmetic changes and often a different speaker, at varying prices.
However, because they "run hot", a common modification is to add a bias trim to enable adjustments to the idle current when switching tubes.
I was reading they have the reverb built in after the master volume instead of before...would explain the audible him I can hear when it's sitting idle....bummer. I just found bit of info saying that there is supposed to be an inspection style sticker with 2 letters written on it- one letter represents the year and the other the month it was made but I can't see a sticker anywhere and it can't be made in 1991 because that would mean it would be made in the USA for a start when it's made in Mexico.
I had no idea it was so old, it doesn't look that old. 24 years old would make it one of the the old "green" circuit board amps.
The original circuit board underwent a major redesign in 2001, when production moved from the US to Mexico.
The earlier circuit boards are green in color and are noted for a "darker," more bass-inflected tone.