1 Cash - Anonymous Kaiyuan Tongbao, Luo

The Kaiyuan Tongbao was introduced in 621 under Tang Emperor Gaozu and became the foundational coin type of the dynasty — struck for nearly three centuries with only modest variation. The "Luo" mint mark refers to Luozhou, one of several provincial mints activated during the latter Tang as central authority fragmented and the court lost reliable control over coin production. Issues from this period are technically anonymous in the sense that no reign title appears; the Kaiyuan inscription persisted long after the reign it named had ended, used simply because it had become the recognized currency standard.

The date range 841–907 brackets the post-Huichang suppression era through the dynasty's collapse. Mint attribution for late Tang provincial issues relies heavily on the placement and form of the mint mark relative to the square hole.