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If, after reading this material you can’t find your serial number, see the Serial Number By Location table below for more specific detail per amp.

For amps built before then, birthdate information may be available on the outside of the chassis near preamp tubes (as shown above) or, inside the chassis which requires disassembly to see the inside) but these dates are not always availablew on every model. Some people like to know the 'birthday' of their amps and many will be pleased to find Mesa techs initialing and dating the amps in plain view very near the serial number decal on the amps since 2008-2009.

Mark IIB amplifier with tech initials and assembly date on the underside of the amplifier between preamp and power tubes