Thanks so far everyone! Love this type of collective thinking! Some interesting thoughts so far, keep them coming.
I've just had a wild idea about the 22ct mark...bear with me! You know like the ceremonial ground breaking spades presented to dignitaries...would it be along those lines, like a retiring lock keeper gift etc. Obviously in gold plate on bronze? (Although the mark is the same as on a piece of my jewellery but without the city and date stamp, if it did mean 22ct plate it would say plated in theory to be assay legit)...just an idea, shoot me now 😉