http://www.omnicoin.com/coin_view.aspx?id=939181
I was in the Czech Republic this summer and kept all of these that I came across (3 or 4). They only made them for one year and then the 50CK denomination became a bill instead. I think they are great looking coins with the river and the bridges of Prague on the reverse.
Great for a bi-metallic set or a United Nations set (Czech Republic was admitted to the UN in 1993).
Numismatic value aside 50CK is currently worth $2.78
Make me an offer!!!