I found this in the estate of an elderly lady who passed away. It is in its original box and has the original metal pin setup and pins/balls. Her children had them when they were little. I have only found two pictures of it online and no prices to match. The picture is not of my set. The box is dirtier.
This item is in great condition. The top flat surface has 5 water-droplet sized spots of copper discoloration (green tint) as well as a thumb-size green discoloration near the serial number. The serial reads F60725. The sides have decorative markings on them, but the front and back have no markings. The lever on the right functions as a reset. The red key moves up and down, but I can't figure out how or if it works (the oldest calculator I ever used was made 80 years after this beast.