Old Sheaffer "Lever fill" Ink Pen

I remember these pens from using them in school back in the 60's. Of course this version is maybe 20 years older. If one of these went to leaking, well, your shirt or pants were ruined. This one belonged to my paternal grandfather. It's the kind with the arm on the side where you stick the end of the pen down into the ink and "pump it up" into the pens bladder. Pre ink cartridge days.