1 Gram of 22-karat gold. Grade: Reverse PF 70 (Proof 70), indicating a “perfect” specimen with no visible imperfections under 5x magnification. You can use this number on the NGC website or mobile app to verify the coin’s authenticity and viewing population data. The Back of Coin features a likeness of the reigning monarch, while the Front of coin displays a detailed profile of a Tyrannosaurus Rex.