They are all usually within a few months of each other.
Use the latest one to give you a good idea of when it was made.
There are other ways but the above is a more accurate method.
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The first of the three digits tells us the last digit of the year (unfortunately not decade specific) and the last two numbers tell us the week.Up until the end of the blackface era (1967), all amps left the factory with a tube chart that had a two letter date code stamped on it.The tube chart date code works like this: the first letter indicates the year and the second letter indicates the month.only come into play when you’re trying to value the amplifier in the Blue Book for Guitar Amplifiers per the model description that is provided.They are not of a concern with dating as only the 2 letter date codes on whichever chart or sticker and the transformer number comes into play for that....