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These codes have been used on components including potentiometers (pots), transformers, capacitors, tubes, and speakers.
The code usually consists of 6 or 7 digits such as 137634 where the first two or three digits is the EIA code for the manufacturer (137 denotes CTS), the fourth digit and sometimes fifth digit denotes the year (in this case it could be 1956, 66, or 76), and the last two digits denote the week of the year.
The code contained information regarding the manufacture and date of production.
An Ampeg from 1960 would be covered in navy random flair vinyl whereas an amp from 1965 would be covered in blue check vinyl.
Another check for a 1960 versus a 1965 or later serial number (i.e.
The only date codes that seems to be readily available is found on the speaker magnet located under the bell cover.
The Ampegs made between 19 did not have serial numbers and must be dated in the same way as the Michael-Hull models, specifically, by finding the EIA date codes on pots, transformers, multi-section "can" capacitors, and speakers.A Super Echo Twin with serial number 404553 was made in 1964 (4), during April (04) and may have been the 553th amp made that month (553).