1 Mon 'Mannentsūhō' - Junnin

The Mannentsūhō was issued under Emperor Junnin in 760 as part of Japan's early imperial coinage system, its value pegged at ten times the preceding Wadōkaichin — an ambitious denomination jump that the market largely refused to accept. Hoarding began almost immediately, as holders recognized the overvaluation, and the coins disappeared from circulation within years of issue.

Junnin himself was deposed in 764 by Empress Shōtoku, exiled to Awaji Province, and dead within a year under disputed circumstances. The coinage bearing his reign effectively ended with him.