Here is another unsual hex called the Treasure Hex. Not sure of the source, but it is from a series of hexes I found in the Dutch collection I purchased.
Catan News
A rare find? Is this an early pre-release test game of Catan
I have been very fortunate to acquire what is apparently a 1995 pre-launch Catan set used to test and promote Catan before the first commercial set with the Franckh logo was released.