So in the same trade as the Byzantine gold piece I got this as well. Kunkel’s Opera Troupe was a minstrel show in Baltimore in the 1850s operated by George Kunkel. This show is well-known for employing John Wilkes Booth as an actor (before he left for a better job at Ford’s Theatre in DC). Kunkel’s would counterstamp coins in Baltimore commerce to advertise their shows. About 50 coins are known in total with the Kunkel’s counterstamp, most of these are Spanish-American 2 Reales. Several other types are known as well. This counterstamp on a Draped Bust Dime, a scarce type to begin with, is unlisted in Brunk, making this piece likely unique. Between a historically significant counterstamp, an elusive host type, and the fact that not even Bezos or Musk could have two of these, this may be the coolest piece in my collection.
Here is one posted on CoinTalk https://www.cointalk.com/threads/lets-see-your-exonumia.203005/page-23