Try as they may the spectator cannot open the box and remove the coin.
When the performer does so, the spectator cannot close the box!

Quality prop, made in wood.

https://www.alakazam.co.uk/product-merli......afe.html

This is a well known mechanism. If you want a super nice one check out Heartwood Creations:

https://www.amazon.com/Heartwood-Creatio......&sr=8-33

Thanks for the heads up, Magic Mike ...
nice routine, but too elaborate for my taste.

Thanks for sharing

I have the original Merlins coin safe.

I agree with wulfiesmit.

The plain looks goes well with my patter.