Ampeg may very well have used 100 or 101 as the starting point during slow production periods.
Nevertheless, for dating purposes, the serial number provides adequate information during this period.
Cheaper than firing up the Harley to go looking for the perfect rock date.
This information original was found on The Unofficial Ampeg Page ( which appears to be dead.
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.
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