1960s Smith-Corona Super Sterling
Here's a basic but reliable Green Smith-Corona Super Sterling made in the 1960s. While it may not be the prettiest typewriter, it types extremely smoothly, and can definitely be used heavily. It's in good condition, but does have a few marks on the paint. If you're in the market for a no-frills workhorse of a typewriter, then this is probably what you're looking for.