https://kineticcraftspuzzles.com/products/mighty-pin
"Mighty Pin is both a continuation of themes that were established in the previous puzzles as well as a brand new experience of it’s own. Can you release the quarter from the box?
This is designed to be the most difficult of the three puzzles and contains the most ambitious mechanisms of any of my puzzles to date. You have been warned!"
The puzzle is located in the US. Buyer pays shipping. Payment is accepted via Zelle or PayPal Friends & Family.