How did this work out for you?
I have the shares (two certificates) and they seem to be legitimate. I'm in the process of investigating how I might, in due course, trade them. As I suspected, finding a broker who deals on the Frankfurt Open Market isn't easy - any suggestions? The only one I've been able to find so far who will both handle certificates (i.e. convert them to electronic form) and also deal in that market is Barclays, who are in the process of checking out the settlement end of things (as apparently there can be settlement problems in transactions involving some companies registered in America).
btw, I just saw a post suggesting that Viridis Technologies Inc isn't a registered company. Do you know what's behind this suggestion?