This stapler was made by the Lihit Industrial Company of Japan, and dates from around 1986.
It is a stapler that doesn't use staples. Instead it cuts a little flap in the paper, it also cuts a slot, and it then tucks the flap through the slot. But from the users point of view, you just push the stapler down as if it was a normal stapler - the clever mechanism does the rest.
There was a Lihit Number 6 which crimped the paper together, although we thought that it was a less efective mechanism. We have never seen the Lihits 1 - 4, so we have no idea what they do, or even if they exist at all!