It is the 1970s, established typewriter brands of course had to venture out into the exciting new world of the electronic calculator. This pleasing calculator was made in 1972 for the Litton Imperial Typewriter Company under it's Royal brand as the Royal Digital 5-M.
The calculator had five functions, the four basic arithmetic functions and percentages thanks to algebraic logic, and also had memory. The calculator had an 8 digit green vacuum fluorescent tube display.
A new arrival, but its not a typewriter! I actually collected calculators for a few years in the early 2000s before stopping when it became trendy and thus the prices on eBay went a bit silly. I thought i'd buy my first vintage calculation machine for a while then, and it is this mains powered Litton Imperial 1260. A sticker underneath it says July 1976 so perhaps this is when it was procured originally.
Despite the age, and the fact the power switch seems broken, it does power up! It can display numbers though does not seem to be able to perform any calculations anymore which is a shame.
