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In addition to a source code, it may be desired to identify the date of production.This can be done by adding, following a hyphen (-), the last two digits of the production year plus the number of the week of that year.
Then two more numeral digits are added for the year such as 63 and another two are added for the week of production. Again the 134 represents Centra Lab for the potentiometer manufacturer, the 63 stands for the year 1963 and the 20 represents the 20th week of production.Here is a cool link to a Vintage Fender Amp price history chart that tracks sales data for specific amp models by the month.Date Code: Wide panel, narrow panel, brown, blonde, and black face amps have a date code hand-stamped on the tube chart. The first letter translates to the year and the second to the month. Example: FG=July 1956, QA=January 1967, and a reissue CG=July 1992 EIA Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stampted with a date code indicating who manufactured them and when.If you are unsure if the digit denoting the year is in which decade (1957, 1967, etc.) then try to determine this by the amplifier it is in.Tweed amps were made from the very early 1950’s through approximately 1960, blonde and brown amps were introduced around 1961 through 1965, blackface amps with black tolex started around 1964 through 1967 and silverface amps took over in 1968.