10¢, ND-MS63, Bonded 2 piece die cap, ANACS. While their are many dramatic errors in this collection bonded die caps are generally the most visually striking. bonded die cap forms when a struck coin becomes a die cap and a second planchet is fed beneath it and struck. The two pieces fuse together under pressure, with the upper coin acting as the cap and the lower coin showing a strong, distorted brockage. The pair remains permanently bonded, creating a dramatic error.