6,1 x 15,5 cm strip of cloth with the Nomicon logo printed on it. It's more yellow than the picture shows: I got it from Tommi when I ordered stuff from his Aquarius distro in '98, including the Nomicon promo 1998. I think it actually came with all orders of that for a while? Anyways, never sewn this on anything yet so it's as good as new as this sort of "patch" can be.
This might actually be a fun, nostalgic filler piece on a vest, this isn't a common shape after all.