Hello Harmony.

I've had a lot of success just searching the web for pictures of other's bikes. Once you stumble into some that are similar to yours you'll start to zero in on the vintage which will further simplify your search.

Here's a pic I stumbled into on my first try...
http://www.morcmtb.org/classifieds/s...e=IMG_3425.JPG

Welcome to the Forums and Good Hunting!