Thank you Beraint and Ford for taking the time to respond.
I included 2 close up shots without explanation but it was to show the extra work some craftsmen go to such as the engraved curved lines around the central hole. In reality these lines are quite fine and accurately done.
I wondered if such extra embellishment was part of the original mon or added by the craftsman just because he liked the extra effect ?
Something like you get with the fine line brass inlay that instead of finishing at the rim edge- is mimi the term ?- goes over and onto the edge.
Quite a bit more effort from the times that predated power tools.
Much to be admired in the way a craftsman will produce a work to impress others but more particularly in the way a top craftsman will want to satisfy his own standards and values.
It's part of what gets us collectors in I think.
Hope you didn't mind my rave.