UK Hallmarks on Gold, Silver, Platinum file (from Assay Offices of Great Britain) York Assay Office Marks (from The Silvermine) York Silver Marks 1559 - 1857 (from The Silvermine) Belgian Marks Belgian Marks (in French -- from Association Of Small Collectors Of Antique Silver) ...
Turquoise Jewelry or Native American Jewelry artists. We may not have the Artist or Hallmark listed that is on your jewelry. If we do not, please consult the book: "Hallmarks of the Southwest"
But there are links on this thread to books on the topic, to helpful pages of hallmarks, to suggestions that you check eBay for similar items [adv: item on eBay], plus some general hints that silverplate probably has no value. So I'd suggest reading the previous entries rather than wait...