Scotch & Soda (US Half & Centavo) by Roy Kueppers

Enjoy coin magic performing one of the most classical effects! Place a half dollar and a Mexican centavo coin into your participant's hand. To your participant's huge surprise, one coin disappears and turns into a totally different coin! Very easy to perform.

This is the locking version, which requires a bang ring to reset (included).

Comes complete with bang ring,  precision machined coins, full instructions and routine. If you'd like further instructions, I recommend the World's Greatest Magic download video.