Rikitake No.119 Shoko Esumi.68 ((free))

Tape 68 had no date. No content note. Just the name: Shoko Esumi.

The name is most famously associated with Tsuneji Rikitake (1921–2004) , a Japanese geophysicist who proposed the "Rikitake two-disk dynamo" in 1958. This model was a milestone in chaos theory, demonstrating polarity reversals in Earth’s magnetic field through a pair of coupled dynamos. Rikitake No.119 Shoko Esumi.68

If you find a piece claiming to be , check the kutsu (heel) of the vase. Authentic pieces show goma (sesame seed) spots—small charcoal dots from the pine-ash firing. Tape 68 had no date