All good, thanks for the extra info.
The reg mark is, as I understand it, a kind of registered design/patient number?? Happy to be corrected there.
And along with JA Wylie, Fattorini seems to be the major supplier. Gaunt is often seen as well, but I have to say I am not really experienced in these enough to be categorical. Hopefully the area 22 mystery will be solved by someone as well.
Thanks, Tim
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