ClipArt ETC
"The upright single-stroke "commercial gothic" letter is a standard for titles, reference letters, etc. In the proportion of width to height the general rule is that the smaller the letters the more extended their width should be. A low extended letter is more legible than a high compressed one and at the same time makes a better appearance." —French, 1911

Upright Single Stroke Capitals

"The upright single-stroke "commercial gothic" letter is a standard for titles, reference letters, etc.…