Postby Francais » Thu Aug 29, 2013 10:02 am
That should help, but it doesn't. M fits in the spacing, so I am sure you are right. Unfortunately, SPM is not a listed maker, at least not in any of my books. Evidently Sotheby's sold two, but their site seems to be down, and they just described the mark and couldn't find the maker either. I think the best bet is still Nantes, but their is no silversmith with a last name of M or P-M. There are a few books on Poitou silvermiths, but they are only available in the National Library in Paris.
Sorry,
Maurice