What you have there, Glenn, is a profoundly low-end bike. My guess would be 1980s.
However, it looks clean and in excellent condition. What does it need to function?
The main issues might be whether the brake and derailleur cables move smoothly in the housings and are adjusted properly. Otherwise, the only issues would be whether the bearings have plenty of grease. If the wheels, bottom bracket, and headset turn smoothly and don't make any squeaking noises, they are probably fine.
Are there any issues with the performance of the bike? (braking, shifting, chain skipping, etc.)