Ricoh Rikenon P 50mm F2 Standard Prime Lens Pentax K Excellent from Japan
It was founded by the RIKEN zaibatsu on 6 February 1936 as Riken Sensitized Paper (理研感光紙 Riken Kankōshi). Ricoh's headquarters are located in Ricoh Building in Chūō, Tokyo. Made in Japan. It's overall in excellent condition.