epigramophone wrote:These chalk inscriptions are commonly found. I believe that they were written by assembly workers on the production line for quality control purposes. If the machine was ever returned to the factory for remedial work, the marks would identify who had assembled it at each stage of production.
I see. Thank you. I recently wondered though if the '10 x' referred to it being a 10(1) series and either a universal part or the x being a Roman Numeral for the number ten. Something destined for a specific part of a warehouse.
Sadly I suppose, like so many other things about gramophones we shall never know for sure.