this is a very special instrument which Professor Unger designed and engraved while on sabbatical in the Czech Republic. He was staying in the city of Prague and, as this was his first trip to Europe, he was inspired by the great architecture of the land. Doug spent the summer painting in the Czech Republic as part of a grant. He worked on this banjo in his spare time while amidst the castles of the old world. Made at Prague Castle, the banjo exudes this inspiration. It is affectionately known as the Prague Banjo. The rim is an old, 10-3/8 inch Cole Eclipse.