Olympia RA16
One of the last mechanical machines made by Olympia, designed in 1961. It has the same colour theme as the little manual and electric two-function adding machines, but this is a full-fledged four function calculator, fully electric with constant storage or memory, and back transfer from and to all registers. It is really a marvel of technology. Unfortunately they all malfunction as the grease and oil go sticky with age, mine malfunctions as well - that is to say, it miscalculates. I stopped playing with it before I blocked it completely, and if I feel really brave at some point, I might open it up and try to repair, clean and grease it. It is a very impressive machine when running.