Thanks everyone. Its been interesting. Just another small wrench in the works ...Mine measures exactly 22cm and the base is 6.2cm not 6.5. Also that one seems to have a bit of a curve going up to the top / rim wall. Mine is very square there.
I kind of remember reading , a long time ago, about Riihimaki taking over some of Nuutajarvi production when they both got taken over and ended up under the same ownership. But I might have this wrong ...and I can't find any reference to it now. ED.