The new system designated the year of manufacture in the first two digits of the number and the week of manufacture in the last two. Starting in 1993 until 1997 Marshall switched over to a new serial number system. Photo credit: Mike Bratihwaite at Cathedral Stone. S/L would indicate the model Super Lead 100 watt S/ would indicate the model which is 50 wattįrom January 1984 to October 1992 the date code letter was put before the serial number. From July 1969 to December 1983, the letter denoting the year was put after the serial number. The serial number on a Marshall amp is usually located on the back panel of the chassis but some amplifiers made between 19 had the number on the front panel. The letter B was skipped because the letter A was used for 18 months and the letters I, O and Q were also skipped to avoid any confusion being mistaken for numbers. Here are the letters with their corresponding years. A/ or /Aįrom July of 1969 until September of 1992 the date code system included a letter of the alphabet in the serial number. The charts below will explain how to read the serial numbers and decode the model numbers.įirst here is a chart with the model numbers and what they mean for this era. There are easy ways to determine date of your Marshall amplifier’s manufacture by the serial number.
