Check the listing for details. m.j. Rooy Mechanical Calculator Vintage - Working. Condition: Used, Made in France. Listed at 128.47 USD. Sell authentic mechanical calculating machine from the French brand mj Rooy. A magnificent example of precision engineering, combining industrial aesthetics and reliability. • Condition: Perfect working condition. All cranks and sliders manipulate the numbers fluidly. The reset is done without a hitch. • Aesthetics: Very good cosmetic condition. Original gray hammered effect paint, very well preserved. The markings and numbers are perfectly legible. • Details: Complete model with its 4 original suction feet for optimal stability during use. Ideal for a collector of office machines, a cabinet of curiosities or high-end vintage office decoration. • The object is heavy and fragile: packaging will be carried out with multi-layer protection (bubble wrap and reinforced cushioning) to guarantee.