Although described by PCGS as a Double Struck and Large Brockage, it is actually a Reverse Die Cap. There are only two known die caps on the newly-designed Jefferson Nickel (2006-2024). The obverse was designed by Jamie Franki. The reverse is still the original Schlag design.

The creation of this die cap merits an explanation. The hammer die (top die) had the reverse Monticello design. The struck coin adhered to the anvil die (bottom die) which had the obverse Jefferson design and was struck into incoming planchets. This die cap created brockages as it expanded and cupped upwards.

A fascinating mint error with a complicated sequence of events creating this reverse die cap, one of only two known!

Die Caps are featured in
my NLG Award winning book,
World's Greatest Mint Errors.