I have several sizes of these pens from many moons ago. They were given to me by a friend whose grandfather, I believe, was a professional sign painter. I think The Faust is an automatic shading pen? From what I've been able to dig up, it's supposed to write with a line, a gap and then a thicker shade. I can't quite make it do that, but haven't really tried thinner ink in my larger sizes.
The other with the folded brass inside is the Bridgeport Pen Co. model. I have several sizes including a huge one. This is a medium size and is 1/4" (about 6mm) wide. I have another that is closer to a whole inch wide. I'll have to measure it later, it's at home.
The Faust is more difficult to handle and the Bridgeport pumps out the ink like there's no tomorrow. I posted an example below. (I was having too much fun with the "n" and just couldn't stop)
The Bridgeport is fun and smooth to write with, but you won't get the sharpest line. But if you want to write big, these work great.
I seem to remember my friend say his grandfather used to use these mainly to make the signs in grocery store windows that advertise the latest specials.
Any information on what the Bridgeport one is called and if they still make them. And any info on the Faust automatic pen are appreciated.
thanks!