Among the portable mechanical calculators of the early 20th century, this Rema model stands out. Mounted on a small oak wood platform that serves as a base for its protective box, finished in honey tone varnish, it is presented with its original black enamel finish in very good condition. Likewise, the numbering of all its parts, as well as the addition, multiplication, subtraction and division indications ("Add" "Mult." "Subt." and "Div.") present a really enviable state of both engraving and painting. Its mechanical operation is clean, fluid, gracefully meshed, allowing enjoyment of both the object itself, and the inventive capacity of human ingenuity