I figured... but would still like to try and figure out how old it is.
Send the serial number to Ampeg customer service and enquire.
Submit a ticket here: https://ampeg.com/account/login.html?user_attempt=
Or you can call them:
The support team for US customers can be reached at 818-575-3600 (option 2), 8am – 12pm & 1pm – 4pm Mon-Fri Pacific.