[crashryan]

Intrigued by the ad for a "Speedry Brushpen," I did some Googling and learned it was a fiber-nibbed fountain pen similar to the better-known Flo-Master, which was used by 1940s/1950s illustrators like Robert Fawcett.. Nowadays the Brushpen would be classed as a marker rather than a pen. The special ink dried immediately because it was highly volatile (toxic, too, probably). I once bought a couple of never-opened cans of Flo-Master ink at a flea market and found both empty. The Speedry pen seems to have had a good run: this comic is from 1943 and the company was still making pens in the 1950sw.

Link to the book: Boy Comics 11