It's not a Sibex, but it looks exactly like one and may be a very early version of what they eventually made/sold? It's actually much nicer quality and is already 10 years old and still going strong, I bought it in 2002, the guy who had it made for me was in Wisconsin and once I got the fork I never heard from him again.
Thanks for the comments and compliments, I love this bike and am the original owner.