SkilCraft is a trade name of the National Industries for the Blind, an organization created by the Wagner-O’Day Act of 1938 to create employment opportunities for blind Americans. Products bearing the Skilcraft brand are commonly used in United States federal government institutions, including the United States Postal Service.
Blind workers assemble the pens in factories in Wisconsin and North Carolina. The original 16-page specifications for the pen are still in force: It must be able to write continuously for a mile and in temperatures up to 160 degrees and down to 40 degrees below zero.
It has been used in war zones, and was designed to fit undetected into U.S. military uniforms. According to company lore, the pen can stand in for a two-inch fuse and comes in handy during emergency tracheotomies.
Source: Ultra Facts