A Russian cut rock crystal stamp with an etched monogram MF on the head. The piece is adorned with a gilt silver crown finial and laurel overlay with diamonds. The hallmark of 88 silver standard and the maker's mark are located by the finial. The item comes in its original box. MF presumably stands for Maria Feodorovna, 1847 to 1928, the wife of Emperor Alexander III. Collectible Russian Silverware And Jewelry, Luxury Desk Accessories.