What's the seatpost diameter? If it's 26.6 it's a Tempo that has been reworked with a top mount shift boss. If it's 26.4 with that top mount boss it's a LeTour or a Super LeTour, which were built with unnamed double-butted chrome-moly.
As an aside, from 1986-1991 LeTours were built with True Temper double-butted tubing and took a 26.6 mm seatpost.
I recommend
these scans from Waterford.