Vintage 9 nixie tube calculator by APF Electronics, Hong Kong, Mark 1. It works great but the first two nixie tubes on the left side do not light up. The other nixie tubes are nice and bright. It will do calculations but only to 7 digits. Calculator is in great shape, there are a few paint specks, but no cracks or chips. It is a solid machine. Measures 10" by 6.5" by 3.5" tall.