His name was Wilson Reid Lowther and his serial number was AO 860517. Here is a good reference: How To Date A Marshall Amp This guide will help you decode the serial number and model number of your Marshall amp to finds its date of manufacture.
Serial in mind amp no reliable serial number information exists for pre Marshall amps, so if your amp doesn't have a number matching one of the formats below, it is likely pre and identifiable by features rather than serial number. The charts below will explain how to read the serial numbers and decode the model numbers. 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.
