I finally restored this old Sheaffer “School Pen” that I’ve had for a few years after buying it for a few bucks in a small baggie of pens (which included a Parker 61!). It had probably sat unused for multiple decades. The ink feed and original cartridge were all gunked up, but I was able to flush it out and put ink directly into the clear pen body. I love how the ink sloshes around as I turn over the pen in my hand!