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.These are rough guidelines to help date your amplifier.
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So you need to figure out the year of production for your Fender guitar or bass. Fenders rank as the most frequently bought and sold instruments on Reverb, and finding a precise date of manufacture can be key to determining the value and specifics of an instrument.
The most important thing to keep in mind when dating a Fender is the highly modular nature of the designs.
On the inside of your vintage Fender amplifier there is a paper chart with the tube locations for that particular model. On the tube chart there will be a rubber ink stamp with two letters.
In the chart below you will see the letters that coincide with the year and month of the amps manufacture.