its late 80ees for sure. ubrakes and the non matt black paint job indicate that.
exact date is hard to tell because marin catalogues from the 80ees are rare if not non existent.
Late 1987 available, and think it was featured in the '88 brochure, and even later appeared on the backpage of '90 brochure, seen riding across South America or somewhere remote. Think that had Red forks and frame. Love the slack angles!!