Give us a picture or two. Does it have a fillet brazed or tig welded frame? Fillet brazed stem? Bullmoose bars? If so, are they fillet brazed or tig welded? Any stickers mentioning frame tubing. All of this will help narrow the search.
The shop I worked at during from '84 to '88 carried Ritchey mountain bikes. I own an '85 Commando. It has a fillet brazed frame and tig welded bullmoose bars. Camoflage paint job. Custom paint was common during that time.