The Clover Needle Threader and Thread Cutter is still in production, but this one is older and much sturdier.
You'll find it nice if you thread your needles often, for embroidery, for example. It is called a desktop threader because it sits flat on your sewing table for handy use.
The base measures 3-1/8 inches by 1 inch and it is 2-1/4 inches tall.
It appears to have been lovingly used with very little wear. No instructions are included, but the newer models work in the same manner, and you can find instructions for them online.