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Collins Gem Antique Marks, Anna Selby and the Diagram Group, HarperCollins Publishers, 2002 edition, (original 1994) This book makes reference to the older gold and platinum marks and the orb mark mentioned in general for platinum with limited history similar to the info in the Miller's. Regarding B...

A Collins hardcover pocket size guide, I believe it mentioned at the head of the Birmingham silver marks section. I also have a Miller's guide, but it it doesn't say much about platinum marks or the Birmingham laid flat anchor except the current marks and old gold, and that it wasn't necessary to ma...

One of my silvermark books says that Birmingham anchors positioned on the side are indicative of platinum over silver. My marks in question, anchors are on a couple small folding MOP fruit knives and are on different sides for the years. Bottom facing leftside - 1863 "GU" George Unite- Bottom facing...