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was made can be determined through a variety of sources.
Cabinet Sticker By far the most reliable way to date your amp is to look for the month/date code stamped on the tube layout sticker on the inside of the cabinet.
Besides, no article in the Dating Fender Amps by Serial Number series would be complete without some interesting information, n’est ce pas?These are usually in the form of a six-digit number with the following formatting scheme: The first three digits represent the manufacturer code, the next digit represents the year of production and the last two digits represent the week of production.Thus as an example 606452 is a transformer code: 606 tells us it is a Schumacher transformer made in either 1964 or 1974 and and it was built on the last week of December.A 1957 tweed Vibrolux was reported with a tube chart printed with circuit “5E3” (tweed Deluxe) instead of the correct 5F11 (see photo).Clearly Fender wasn’t afraid to use incorrect parts when they were in a bind. The 5G12 Concert is the earliest version from very late 1959 and early 1960 so the existence of a tweed example, while extremely rare, is certainly plausible since Fender was making lots of tweed amps during the same time period.