Brand: Mitsubishi Pencil Co.
Made in: Japan
Hey, not sure what is written on the reverse. I've got many Japanese pencils with wonderful personalized advertisments. In my opinion this writing makes the pencils far more interesting with all the kanji. The 2nd image is missing the 8800.
Founded in 1887 and formerly known as Masaki Yomato, Mitsubishi Pencil Co., Ltd. is best-known today for its “uni” brand of quality writing instruments sold worldwide. Curiously, this Tokyo-based business is unrelated to Mitsubishi Motors and other brands within the Mitsubishi Group. Same name, same logo, completely different company.