Here in full focus stacked macro glory is the limited edition Taccia Miyabi Imperial Koi. The background is, I think, byakudan-nuri whereas the fish are in rankaku with mother of pearl raden eyes. Usually, koi are not usually represented this large but Taccia made the specific choice to render them this way to good effect. Sailor nib so it writes well.
focus stacked logo by Ja Ja, on Flickr
focus stacked koi closeup logo by Ja Ja, on Flickr
cap logo by Ja Ja, on Flickr