Up for sale as a completely unused Igarashi Koppa. Despite its bench stone proportions, it is definitely on the smaller side, measuring 148mm x 44mm x 29mm. It is literally unused so I can't comment on this stone's specific performance but Igarashi/Ikarashi stones are mid grit naturals, purported to be in the 1-2k range and cut fast for being a mid grit natural (which typically cut much slower than their synthetic counterparts).
$60 including shipping and fees, if any.
Here are some pics. No "in use" pics as this is an unused stone. If you'd like to see it wet, I can gladly do that upon request.