Hi,

I also have a bike made by RIH in Vienna. I also thought mine was from the Dutch company, but I contacted them with my serial number and they replied that there was also a Viennese company of the same name! Unfortunately RIH Vienna does not have a web site or email address that I could find, although Yelp has them on their site. Sorry, I don't post enough to be allowed to attach the link.

Cheers!