The Dietzgen Excello | In the 1920s German manufacturer Eugene Dietzgen Co. designed and produced this brilliant drawing tool, the 932S Excello, for draftsmen. My mouth is... | By Piranha Tools | Facebook
This Dietzgen Dotting Tool at work. : r/oddlysatisfying
National Museum of American History
Dietzgen Collectible Drafting Tools for sale | eBay