The main tubes are 6013 aluminum alloy, which is about 10% stronger than the 6061 used in most frames from the era. However it cannot be welded and was glued into lugs. Tubing is slightly oversize to add rigidity compared to standard diameter aluminum frames. The forks and stays are CrMo steel. This cut costs compared to all alumiunum, and provides a traditional appearance compared to chunky, alumuinum stays.
The 4xx series was availble in three models. All used the same frame but differed in components level. The 440 was low end model, costing $250 US and those should be Shimano Z-series components. These bicycles were considered great value in their day.
I didn't think the Techniums appeared until the 1986 model year, though they would have been available in late 1985, which may explain the 1985 Owner's Manual.