1st Special Forces Group (Engravable Version). Part of the Excalibur Engravable Coin Series. This coin is 2″ with 3D imaging. We are offering this coin with or without engraving. If you would like your coin engraved, please select that option in the drop down menu while ordering and you can have up to 3 lines of text. Please add what text you would like engraved on your coin in the comments section on your order.