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Great, thanks for your help :-)

Thank you very much for the idea of turning it around, in fact l think it is T M, if you look at Grimwades 2846, Thomas Mason (1746) mark the M looks like a N with the last stroke of the M very fancy, also the conjoined first stroke of the M is curled around the T and l think the T has folded over t...

https://i.imgur.com/PubLjin.jpg https://i.imgur.com/foit0v1.jpg This top is on a Samuel Welder caster assayed for London 1736, to my annoyance l did not look carefully enough although l must admit it is a good marriage, try as l have, l cannot find the maker of the top section, could anybody help p...