Papermate Advancer 1000 Cassette 0.5 MM Mechanical Pencil

Papermate Advancer 1000 Cassette 0.5 MM Mechanical Pencil

The Papermate Advancer 1000 has been discontiued in the 80s or 90s this pencil offers an ergonomic grip, and a big eraser.

Comes along with 12 leads

Seems that this pencil was designed to be refilled with the cassette only which I doubt you can still find. However you can take out the cassette and slide in refills from the bottom. (Be carefull not to break the leads)

This Pencil has a removable cartridge with 12 leads inside.
Looks like this Pencil was meant to be refilled not by buying any lead and just refilling it rather you needed to get this cartridge in order to refill this pencil.