Any chance you could post some pics?
Also which tubing sticker is on yours, Reynolds?
What Suntour drop outs are on yours? GS? GT?
A friend and I had a similar issue trying to figure out whether his was a 1981 or 1982 model.
His is a metallic black color which I had not seen before. We still are not positive about his.
About the same time I bought a Chestnut colored Trek frame/fork only which looks like the one the Vintage Trek site moderator Skip's 613.
http://www.vintage-trek.com/Trek_gallery.htm
So figuring my model was pretty easy but my friend's metallic black frame puzzled us.
I noticed my 1981 rear drops are Suntour GT where his on the black frame are Suntour GS.
His tubing sticker is Ishiwati 022
Mine is 531.
His black frame S/N is 0171_ _ which on the vintage-trek.com site indicates it is a 1982
610 model but the 82 brochure shows Ishiwata tubing was used on the 410's and
Reynolds 531 on the 613's which would lead me to think the 610's would also have used Reynolds 531.
Interesting but confusing.
We may just be missing some obvious clues some of you guys might clarify.