Yes, I believe the T6C frame that I saw also had the hole drilled through the bridge (caliper brake mounting bolt style), as opposed to the brazed-on boss under the bridge.
The 1987 Montare in the Mountain Bike Specialists retail/mail order catalogue shows the seat stays attaching to seat tube reinforcing collar, as opposed to attaching to the cinch bolt castings. The 1987 Fisher pamphlet doesn't have any photos (or illustrations) of the bicycle itself.