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If your amp or speaker enclosure sports a black-ink-on-white-background barcode label on the chassis or back of the cabinet, then you know that the product was manufactured somewhere between 1992 and the present. Their line of amps include the Italian Greyhound (jazz amp), Redbone, English, Plott, and Beagle (blues amps with varying features), Blodhound (high-gain rock amp) and Basset (steel guitar amp). Oddlings – Yet another printing error has surfaced, this time from the FEI (pre-CBS) days.Email us and we'll pass along your request to the manufacturer. For over half a century, innovative minds have gathered to push the design of electric guitar amplifiers toward new and exciting tonal concepts.Here are the letters with their corresponding years.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.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. Welcome to Amp Archives, a photographic archive of audio amplifiers for reference.For example: S/ 15679 E S/ would indicate the model which is 50 watt 15679 is the serial number E indicates the year 1973 From January 1984 to October 1992 the date code letter was put before the serial number.For example: S/L C 12357 S/L would indicate the model Super Lead 100 watt C indicates the year 1971 12357 is the serial number. Starting in 1993 until 1997 Marshall switched over to a new serial number system.