Large Slide Rule with the box by Aristo from around 1970. Model nr. 0903LL. Made in Germany. It is 32,5 cm / 13 inch. It is an Arsito-Scholar LL with 10 scales on the fron and 3 on the back plus the cm / inches scales, so 15 in total. It is made of plastic, as are the the slider and the case. Great desk piece but very usable as well. Shows minor signs of use only. No paperwork. In yellow and white.