Hi guys, I just picked up an old style rotring 600 silver ballpoint pen with the knurled grip, and I'm extremely pleased with the heft of the pen and the way it writes.
One thing puzzles me though, at the top of the pen, below the "clicker" is a display window that can be rotated and displays 4 colours: green, red, blue and black.
I'm pretty sure mine is a straightforward ballpoint and not one of those multi-function pens, so what is the display window used for?



Reply With Quote
