NGC (1836-1935) U.S. silver dollar 90% silver type-2 planchet. The planchet was intended for a silver dollar (probably a Morgan or Peace dollar.) The planchet weighs 26.7 grams, which is correct.
Silver dollar planchets of this era are scarce. This is a nice example, and is about as nice an example as you are likely to find.
Uncirculated with white surfaces that have an original patina of toning and originality about them.