many thanks to both of you
Looks like I'll have enough reading for a while
The variation of marks seems endless, obviously very many makers no doubt, especially in the C19, and notice that one of my many spoons does in fact carry a diamond registration lozenge, although only one out of hundreds of pieces makes me think it's rare to find the lozenge on flatware. I wonder if this ever occurs on Sterling cutlery? I have perhaps several stamped with the actual Rd No. so, as with glass, this will make it easier to run down a manufacturer. thanks again.