This jolly and retro-tastic piece of beige and black technology from the mid-1970s is a Lloytron Accumatic 320. It seems to work well and has a green VFD display. The calculator is pretty feature rich for it's day with a few extra mathematical functions such as square root and pi to go along with the basic four arithmetric functions.
The calculator is pretty power hungry though, requiring no less than four AA batteries.
