All Fender amplifiers, manufactured after 1989 include a date code on the amplifier. Serial Surfer more. This code is located on the 'QA' (Quality Assurance) sticker, which may be found on the back of the amp chassis. The sticker is a Black and Silver label, which contains several lines for 'sign-offs' at the completion of sound and electrical. I would like to find out the manucfacture date of my DeVille. Is there a way of reading the serial number or would a date be stamped somewhere? Shop for the Fender Bassbreaker 18/30W 2x12 Tube Guitar Combo Amp and receive free shipping on your order and the guaranteed lowest price.