Brand: Mitsubishi Pencil Co.
Made in: Japan
I have one of these with the JIS mark and one without. Again the JIS mark is at least 10 years older than one being made today.
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.