This is a very impressive piece of modern numismatic history! A 2016 5oz Silver Proof Guinea Bicentenary Edition, issued by the modern incarnation of The East India Company (EIC). ​This specific coin commemorates the 200th anniversary of the "Great Recoinage" of 1816, which was the point when the Guinea was officially replaced by the Sovereign as the primary gold coin of the British Empire. ​Coin Specifications & Key Details ​Weight: 5 Troy Ounces (approx. 155.5 grams). This is a substantial, heavy coin. ​Metal: .999 Fine Silver. ​Finish: Proof (meaning it has mirrored backgrounds and frosted foreground details, the highest quality of strike). ​Design: The reverse features the classic "Spade" Shield design, which was originally used on the Gold Guineas of King George III. ​Limited Edition: The booklet in your photo shows the number 0174. These were typically minted in very low quantities (often only 500 or 1,000 pieces worldwide), which adds significantly to their collectible value. ​Why it's special ​Unlike bullion coins meant just for their silver weight, this is a premium collector's item. The combination of the "East India Company" branding—one of the most famous names in global trade history—and the 5oz weight makes it highly desirable for collectors of British-themed coinage