This is an impressive looking mains powered desk calculation machine from the first half of the 1970s (or perhaps 1976 as there is a sticker underneath it which says "July 1976", maybe when it was purchased?) The calculator has the standard four arithmetric functions plus percentages and a memory. It also has a slider switch to set the number of digital places. What RM and RV do i am unsure but perhaps something to do with the memory. Numbers are shown using a nice looking VFD display.
Although my calculator does switch on (or rather powers on - the switch on the side doesn't do anything) some of the calculations can go wrong indicating some bit rot but considering the age of this machine it works pretty well.
