Dating fender twin reverb amp
First I would like to thank everyone who responded to our request for data as outlined in the initial article that was printed in March 1997 issue of TCG.
The Champ has a "C" prefix, the Harvard an "H" prefix, the Princeton a "P" prefix, the Vibrolux a "F" prefix, and the Deluxe a "D" prefix.The 4x10 Bassman used the prefix "BM" while the piggyback Bassman used the prefix "BP." The reverb units have the prefix "R." In addition, the tweed Super, Pro and Bandmaster sometimes have the prefix "S" in the serial number.The blackface and silverface amps (late 1963 to 1980) generally have serial numbers begin with the prefix "A." However, it appears that these were not used sequentially across all models.These 1965 codes begin with the letter "O." The code for the year 1966 is "P." However, someone in the factory apparently forgot to switch the stamper from "O" to "P" in January 1966.Therefore, amps from January 1966 have the date code "OA" (A denotes January) in green ink.