PART VI. Striking Errors:
Bonded coins
Definition: Bonded coins are fused by the pressure of the strike. Any combination of coins and planchets can be involved. A stack of fused coins is called a “bonded pile-up”.The images below show two nickel planchets that were struck and fused together by 1981-P Jefferson nickel dies.
Images are courtesy of Heritage Auctions.
This 1999 Lincoln cent started out as broadstrike with a full, centered, first-strike brockage of the reverse design on the obverse face. Several other planchets were subsequently fed on top of it and fused to it by the pressure of the strikes. The reverse face of this bonded assemblage also struck at least one planchet, but did not fuse to it.
Images are courtesy of Heritage Auctions.