Author: Ready reckoner.
Title: [Koku Soba Hayami?].
Description: n.p. n.d. [mid 19th century?]. Woodcut 17x23 cm printed in black with volvelle printed in blue attached by a paper twist. Nibble from the bottom edge, pretty damn good. ¶ A cute if vulnerable ready reckoner for the poorest classes dealing with grain that has somehow survived intact. I guess that you choose a quantity from the outer edge - with numbers from 50 to100 - and the two inner cutouts show you the answers - whatever that is. I have found a couple of uninformative references which only tell us that it is late Edo - ie before 1867.

Keywords: social science economics agriculture c19th Japan moveable paper toys mathematics