I won this fountain pen on a local auction site (equivlent of USD65) - THE LINCOLN PEN by NATIONAL PRODUCTS CO, CHICAGO. It is in a lovely mottled dark mahogany coloured hard rubber which is proving difficult to get a like photo.
A huge size 8 broad nib which writes a very smooth line.
My research show this to be a hard rubber pen and certainly looks like it, but doesn't exhude the typical sulphur smell?
Innes