ALRO 1010 Commercial rare 12 cm / 5" circular slide rule in authentic metal case Holland NL / 1950's calculating tool

This interesting 1010 Commercial round and colorful high quality slide rule was made by ALRO authentic from the Netherlands, based in the city of The Hague. It comes in it's complete metal case and with the original manual. Made in Holland in around 1950, this one holds various special patents as well. It is in great working condition with only minimal signs of use and age and even comes with the mostly missing instruction booklet (in Dutch). Closed it measures ca 13,5 cm or 5 3/8 inches wide. Do check my website at www.vintagemanstuff.com. I will gladly add any extra items to your package without extra shipping costs. You can email me with any questions at Kevin [!at] vintagemanstuff.com.