This puzzle came from Hendrik Haak's site www.puzzle-shop.de and is listed as "Messingfalle" which translated by Google means "brass trap". Indeed it is a trap, since the object of the puzzle is to remove a coin (not included) from the puzzle. In fact the puzzle has enough space within to hold several coins. The puzzle is sort of in reverse order because you have to solve (ie open) the puzzle in order to place the coin within (since none is supplied), only then would the coin be trapped. You could probably then pass it to someone to try to solve. The coin that I placed in the puzzle is a Singapore 50cent coin, the largest coin of our currency in general circulation.
I first saw this puzzle on puzzle-shop.de but didn't pay much attention to it. It was only when I read Brian's write-up on the Berlin IPP which mentioned someone playing with a brass cylinder with a coin inside that I decided to re-visit www.puzzle-shop.de and discovered that both puzzles were the same...Hendrik Haak must have brought some of his brass puzzles to Berlin IPP.
The puzzle is very well machined and quality is very good. It is a small puzzle measuring about 1 1/2in in diameter. Not at all difficult but nevertheless a nice puzzle to own, particularly if you are into metal ones like me.