Bought this in the late 80's or early 90's. Thinking about selling it. Anybody have a guess. I thought I was able to punch in the serial number a few years back to determine the model. I think it could be a SM500.
Only the SM800 shows in the 1991 catalog as being jade green, but that could be a replacement frame or sold as a frameset. It's not an SM800 as they had a sloping top tube. It has 26" wheels? Steel fork? That would make it SM700 or below. Check the component lists in the catalog and see if anything matches.