I figured out that it's not a dutch frame, although there's almost no information on either company on the web. It is definitely an Austrian RIH track frame, I can't find a picture anywhere online of another Austrian RIH track frame. You can tell from the logo on the front in the gallery. I'm gathering parts for this frame right now, having some trouble figuring out a crankset/bottom bracket combo. The owner said it takes a 70 X 108 Italian threaded bracket, I've found a lot of options but it's tough finding a black crankset that fits this size bracket. Comments/ideas welcome!