1846 $1 PR64 NGC....

"This boldly blundered date has the first impression about 50% below the final date position. In the World's Greatest Collection catalog, Abe Kosoff and Abner Kreisberg cataloged the variety as '1846 over 44.' A half century before that, David Proskey called the variety '1846 over 45' in the Parmelee catalog.
"Proof silver dollars of 1846 exist in two different varieties. David Akers wrote in the Pittman catalog that the 1846 Seated dollars were the only proofs of the 1840s with more than one variety, apparently overlooking the second variety of proof 1845. About 10 to 15 examples of the blundered date proof are known, and about five or six examples of the normal date are known. The known population includes an example in the Smithsonian Institution, along with numerous auction appearances. Our database includes 50 different auction appearances of proof 1846 dollars.
"A wonderful proof, this example is fully and deeply mirrored around satiny devices, all beneath predominant steel-blue toning, with lighter gold and bright silver at the centers."