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The code follows the format: = a number from 1 - 52 indicating the week of manufacture.
You may compare these with your own speakers to determine what you have.
Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stamped with a date code, which indicates the manufacturer and the manufacturing date.
For example, if you find pots from late ‘64 and transformers from early ’65, you can be pretty sure your amp is a 1965.
The following chart, was originally printed in VG magazine, by Gerald Weber.
Greg and Devin's experience meshed well with mine since I'm essentially the blackface/silverface amp guy (amps made between 19) in the group.