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This is good to know if you have a six number source code as the year number can then be lined up with the right decade to properly identify the year the amp was made.
Contact the Gibson company if the source code cannot be found, or has been rubbed off, and read them the serial number found on the back of the body of the amp.
If you do not see a sticker look for engraved numbers on the back surface of the speaker or turn the speaker over and inspect for numbers. The first three digits indicate the maker of the speakers.FWIW: I removed the chassis on my 210HD130, and looked everywhere for a date stamped, written, etc., but found nothing.The speakers were from '78, the serial was in the B5300 range.Yes, you can use the power transformer as another option for dating your Music Man Amp if the original Eminence speaker has been replaced.You also don't have to remove or get into the chassis to find the transformer, and as mentioned earlier with speakers, this needs to be the original transformer and not a replacement.