Kan'ei Tsuho: Possibly the Longest Enduring Coin Ever。Japan, Kan'ei Tsūhō (Copper) - 1700's - Edo Period - History Hoard。Japan, Tenpo Tsuho (100 Mon Coin) - 1830's - Edo Period - History。1668-1683 1 Mon Japanese Coin - Kan'ei Tsuho Japanese Coin。KAN'EI TSUHO, AIZU FUTONO MOTHER COINAll details in photos. Thank you