There are a number of resources available online to help you to date your guitar amplifier or bass amp.
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.
Guitar amplifier dating by serial numbers - How To Date A Guitar Amp or Bass Amp By Serial Number.
It would be more accurate to say that approx 650 of each of these models were produced in ’60.
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.
So if the number on your potentiometer is 304728 it is decoded like this: 304 is the Stackpole manufacturer’s number, 7 means 1967 and 28 is the 28 week of 1967.
Later potentiomters used a two digit year code making the number seven digits long.
For example, the logo on the amp or materials used during a certain time period of production.
Dating an amplifier by serial numbers can be effective as well.
Oddlings – Yet another printing error has surfaced, this time from the FEI (pre-CBS) days.
Besides, no article in the Dating Fender Amps by Serial Number series would be complete without some interesting information, n’est ce pas?
In this case the fourth and fifth digits are the year and the sixth and seventh digits are the week of manufacture.