jonathanb ✭✭✭✭✭

The best option is to spend it. That is a heavily circulated, heavily cleaned, common coin. You can get as many more as you like by using a pencil eraser on any cull wheatie. (View Post)

One type of engraving tool has a hard pointed plunger that moves up and down very quickly to leave a series of marks as shown here. (View Post)

As others have said (repeatedly), your coin is acid treated. If you have not found any other examples like this coin, then you have not looked hard enough: https://www.error-ref.com/acid-shrunk-coins/ (View Post)

Looks like maybe polished dies, but in that condition you really can't be sure of anything. Spend it. (View Post)

https://forums.collectors.com/discussion/892800/getting-close-to-examples-of-original-matte-proof-lincoln-packaging https://forums.collectors.com/discussion/956206/19th-century-proof-sets (View Post)