Hmmmm, interesting thread
I had a set of dynamic coins many years ago in my youth and I think that they were on the old shilling (says he, showing his age)
However, Siege mentioned in the thread how old the effect is ??
Some years ago I picked up an effect called the MT Cylinder in a magic auction. I'm reliably informed that they were manufactured just after the war so will be about 60yrs old.
The effect resembles dynamic coins but only has one fake cap. This contains a stack of 3d pieces (threepeny bits. I believe they were called) with one loose one on the top.
The effect hinges arround making the coins dissapear. When you assemble the two caps with the collar in the middle you hold them between finger and thumb and shake then close to the spectators ear. The rattling is caused by the loose collar.
At whatever magic time you choose you push your finger and thumb offset and so stop the collar rattling thereby making the coins apparently dissapear as you rattle the caps. By simply squeezing with your finger and thumb only you lock the coins into the cap. The quality is such that you can throw the false cap onto the table without getting a rattle.
Tenko.
Yorkshire, UK
Male, 55yrs old, Retired.
"I don't believe it" Luke Skywalker
"That is why you fail" Yoda