This information is derived from “Wrapping Origami” by Yoshihide Momotani (1993). Momotani describes for 3 pairs of paper butterflies:
• Classical Mecho & Ocho (from Kayaragusa)
• Formal Mecho & Ocho (Traditional), and
• Regular Mecho & Ocho (Traditional)
The Classical Mecho is shown below. In his book, Momotani uses white paper with a red border; however, it is likely that the original butterflies made in the 1800’s were made with white paper only. Most ceremonial folds from that era were made with white-only paper.
Instructions to Fold Mecho from Kayaragusa
In step 4, fold only the top layers. Allow the back flaps to swivel towards the front.
If you do a google search for “sake bottle decoration” you will find many examples of Mecho, Ocho and other celebratory folds. Such a search did not result in an image of classical Mecho and classical Ocho as described above. It would seem as if this version of Mecho/Ocho is no longer practiced.
The only image remotely similar is this one showing bamboo water dispensers which are used for the “water alignment” ritual performed on the morning of the wedding day.
Careful examination of the striations on the paper decorations show that they are simply folded in a manner similar to that done for classical Mecho/Ocho. Compared to the instructions above, the only difference is that at step 3, the flaps are folded out without turning the model over. Could this be the only remnants left of Ocho and Mecho from Kayaragusa?