Thank you got it for two dollars so not bad thenI believe that is what is now known as a Sheaffer school pen. If I'm right, it is the same kind I have - in fact, I have 3 of them left over from the late 50s / early 60s. They were ubiquitous back then and sold for about a buck apiece.
Anyway, if it is what I think it is, it is a cartridge pen and takes standard Sheaffer Classic cartridges which are widely available even today. I get mine at Ben Franklin's, a craft store. They come in a 5 pack for about $4 or $5 a pack. The cartridges can be refilled with a syringe. Just be sure to use fountain pen ink, not calligraphy ink in any fountain pen.
You can always use any fountain pen as a dip pen. Just dip the nib into the Noodler's (or whatever ink you prefer) and write away for nearly a full page before having to re-dip it.