Thank you, Agphile, for your comments. I was able to research "wrythen knop," from your comments, and understand what you mean by desirable. Our friend was a wealthy art collector and would have been disdainful of a copy or reproduction, but he could have been fooled and the piece was not in with valuable items. Concerning the metal, I don't know. It does not have the luster of most silver, but feels like silver (tactilely.) It is softer and warmer to the touch than any pewter I have to compare it to and it doesn't feel heavy enough to be lead. As it happens, I'm going to see a silversmith tomorrow to pick up some repaired pieces and maybe he can help me identify the composition. I suspect you're right that it's some base metal.
To me, the hallmark does look worn, but I'm no expert. There aren't any other marks I can see. - The bowl is 1-3/4" wide x 2-1/4" long x 1/8" deep (shallow, almost a paddle.) The hallmark is 3/16" in diameter. The stem is a slightly flattened hexagon in cross-section and dies into the bowl smoothly, with no transition detail. The finial is about 7/16" long x 5/16" wide with no evident seam where it connects to the stem. I just noticed that each of the 6 sides of the stem blends smoothly into one of the diagonal twists around the finial. - I imagine a reproduction would be faithful in all these details.
Here are a couple more pictures. I know you can't make any determinations via the internet, but I include the pictures anyway for a more complete description. - Nino

