Four characters - Kan Ei Tsu Ho / Blank. 24mm, 2.99 grams. Mint in Fukagawa, cast 1739-1741. Silver-plated for ceremonial purposes (see below). Hartill 4.173.
Cast for 3 years from the 4th year of Gembun (1739). This note is taken from Zeno #18077: "The following description was provided by Luke Roberts, University of California at Santa Barbara: The coin is coated with gold and silver because it was used in a house raising ceremony. Houses were built frames first, and when the main ridge beam of the house was built the owner would have a celebration and ceremony inviting all the neighbors. The owner stood on the ridge beam and threw sweets and gold-and-silver-plated copper coins to all the neighbors who gathered below."
Most Japanese coins are very rare. These coins are, however, common - they were inspired by the Ming dynasty cash from China. "Kan Ei Tsu Ho" means "Universal Treasure of Kan Ei".