Logarithmic scale slide rule, model 1053, made by Ricoh. Ideal for precise calculations. The No. 1053 is a slide rule. This is a vintage item purchased in 1968 and kept in storage at home. - Brand: Ricoh - Model Number: 1053 - Type: Slide Rule - Size: Height 5.8cm x Width 33.3cm x Thickness 1.2cm - Scale: Logarithmic scale A slide rule is an analog calculation tool that uses the principle of logarithms to quickly perform multiplication, division, square roots, etc. This is a unique item that allows you to enjoy the operational feel of a slide rule and the atmosphere of Showa retro. It was used until calculators became widespread. How about adding it as an accent to your vintage stationery collection? There are stains, yellowing, and dirt due to age, but the legibility of the markings is maintained, and the slide movement is smooth and usable without any problems. There are small scratches on the corners and minor scuffs, but the condition is consistent with its age. We kindly ask for your understanding that this is a used item stored at home before considering your purchase. Thank you for viewing.