I think Utica was using the BLACKHORSE system, but I don’t have a lot of documentation on Utica. The best I can come up with is 1971, 1973, 1981, or 1983.
If I were putting a date in my report, I would put 1981-1983 since you seem to think mid-1980s anyway. What leads you to believe mid-1980s?
Sorry. I never make it to HVAC until late, late or early, early. Hope I could help.