[MENTION=205648]Hummer[/MENTION] - that's awesome information! Thanks so much for finding all that out and sharing. I think mine is somewhere around 1984, give or take a year or maybe 2. I kept the quill stem/handlebar, however replaced it with a Kalloy Mountain riser silver handlebar to get the bars up higher. I searched high & low and decided to try the Civia "Aldrich" handlebars in silver.

Universal Cycles -- Civia Aldrich Handlebar

The new stem & handlebars change the look a little, but it's not detracting IMO. I changed out the Panaracer Paselas for Continental Travel Contact tires - smooth down the center with slight knobs on the sides, along with sort of a brownish markings on the sidewalls.
Anyway, your information is enlightening. If the first number is a year then that could be an '85 for mine.