John,
At that price, tell the guy that you will pick it up yourself in Prague and you'll still be making a good deal.
I noticed that the item is no more listed on Ebay and I'm pretty certain that somebody really got a good deal on this one.
Also considering that this trademark was never seen with a Rohm inscription, would make this dagger quite unique and worth a lot more than what it was listed for.
Alright now, who's the rattle snake that bought it ?
