Amazon.com : ALVIN DM357C Draft-Matic Mechanical Pencil, 3 Pack, Stainless Steel Drawing and Design Tools, Great for Drafting, Architecture, Engineering, and Art - Includes 0.3mm, 0.5mm, and 0.7mm : Alvin Draft Matic
Vintage Alvin DRAFT-MATIC Mechanical Pencil 0.5 Mm - Etsy
Amazon.com : ALVIN DM05 Draft-Matic Mechanical Pencil, 0.5mm, Stainless Steel Drawing and Design Tool for Students and Professionals, Great for Drafting, Architecture, Engineering, and Art : Office Products