Special Dutch slight rule (rekenliniaal) by Wolters-Noordhof Company but produced by Fuji Japan. Made in the 1970’s special for WN. Model number is FJ 102. It comes in the original green and white plastic box. It measures is 31 cm / 12 1/4 inch. It features 9 scales on the front and 4 on the back as well as a cm scale, so 15 in total. The slide rule, the slider and the case are made of plastic. Piece is good but used condition. Also check out the 0903LL by Aristo.