Brand: General Pencil Co.
Made in: USA
This Semi-Hex looks like the ones I used in the 1980's. NOTE the bottom model here is available for purchase here.
Founded by Oscar Weissenborn in 1889 as the Pencil Exchange, it was renamed General Pencil Company in 1923. The family-owned enterprise continues to manufacture pencils today from their factory in Jersey City, New Jersey. Learn more at General Pencil Company website.