This type of major error is exceedingly rare, but in this case I consider it to be unique.

It is a 2010 Bolivian 2 Bolivianos struck on an isolated Chilean 100 Pesos ring intended for a bi-metallic coin. Here, the aluminum-bronze 100 pesos ring found its way into the coining chamber striking 2 Bolivianos. A normal 2 Bolivanos is a large diameter coin, 29 mm, and struck on a magnetic stainless steel planchet. Therefore the striking chamber would accommodate any planchet equal to or less in size. A normal 100 Pesos is 23.5 mm in diameter. Compared to other Chilean die struck isolated 100 Pesos rings I have the weight is correct at 3.3 grams.

This error was also multi struck and off center. The center of the ring has an elongated shape and this coins dramatic visual appearance is similar to that of a bottle cap opener.

My research indicates the Santiago Mint in Chile strikes coinage for a host of countries including Bolivia.

This is the only isolated ring (never joined with a core) struck by dies from a different country I have ever encountered!