I'm not sure exactly what it is. However, the derailleur cables routed over the BB shell, in conjuction top tube brake cable tunnels and an absence of shift levers bosses suggest circa 1983-1984 and endless band, top mount, SunTour shifters. SunTour is the normal pairing for the Dia-Compe brakeset. Bottle bosses above and below the down tube, in conjuction with dual dropout eyelets does suggest a light touring model. Overall, it's reminiscent of an early Sequoia, though there are costs concessions such as the lack of chrome and stay eyelets for a rear rack, etc. If you can get the serial number, that may help.