Uncanceled dies made at the U.S. Mint are extremely rare in private hands. These have been authenticated and certified by NGC. In addition to the unique Martha Washington Cent Size uncanceled die, there are two known that are Half Dollar size. A 1967 Philippines 10 Sentimos uncanceled obverse die was also certified and featured in the NGC article on uncanceled dies. Recently, five uncanceled Costa Rica dies surfaced, including the unique 1897 2 Colones proof obverse die.

This is the only known Martha Washington Cent Size Uncanceled Die in private hands. It was featured on the cover of Mint Error News Magazine Issue 51. There are only two other Martha Washington Uncanceled Dies known. These are both Half Dollar Size dies. They were used to strike the half dollar obverse for the experimental patterns. These half dollar obverse Martha Washington Dies were purchased by Mike Byers. The first one discovered was featured in Coin Week and also featured on the cover of Mint Error News Magazine Issue 44 (Spring 2018).