Here is a real nice desktop Unisonic XL-101 Calculator from about 1975. This one will be on my desk. Uses two D batteries, has a dusk cover and instruction sheet. The XL-101 model had a 10 digit green VFD display and it was one of the reasons I liked them better then the Texas Instrument calculators (except my TI 1265), because I could read the display. In the 70s you could always find the complete line of these great Unisonic calculators at your neighborhood K Mart store. Add them to your collection.