I recently acquired this Friesian silver spoon with a possible upside-down mark. I have never seen an upside-down mark so it probably isn't. Either way, I am not sure of the maker. Any help would be appreciated!
I forgot it looks like the upside-down mark of Sneek silversmith Rein Clases Regnery but as I said, I've never seen an upside-down mark so it could be a coincidence.