Serial numbers and approximate date of manufacture Dating Rickenbackers from 1961 to 1986 Serial letters and numbers were stamped on the jackplate. The first letter gives the year (starting with A for 1961) and the second letter is the month of manufacture, A through L. Dating Rickenbacker models from 1987 to 1991 From 1987 to 1991 the dating is a little different. The first letter on jackplate is the month and the number is the year starting with 1987 represented by "0".
Now we are looking for a letter and a number above the jack. For example a A0= a January, 1987 manufacture date and C2= March 1989 manufacture date.
Electronic Industries Association (EIA) codes can also be very useful for giving clues as to an amp's age.
Unknown Amp Used by Jonny during the sessions for In Rainbows, and for the Scotch Mist webcast.Behold the Ampeg B-15, a simple box on wheels that houses the very crossroads of ingenuity, portability, and sonic superiority beneath its four latches.When Ampeg introduced the B-15 Portaflex (short for portable reflex baffle system) in 1960, it set the standard for all future bass amplification, quickly becoming the most popular bass amp in the world.This information original was found on The Unofficial Ampeg Page ( which appears to be dead.I pulled this information from Google's cache of the site.Jazzier and less surf-y (though Reverberockets may be THE most underrated surf amp ever) than the traditional Fender surf sound.