The Yasutomo Grip 500 is a double-knock mechanical pencil with 0.5 mm lead. It is a rare mechanical pencils, sold in the 1980s, that is no longer in production.
Yasutomo Grip 500 Mechanical Pencil

The Yasutomo Grip 500 is a double-knock mechanical pencil with 0.5 mm lead. It is a rare mechanical pencils, sold in the 1980s, that is no longer in production.