Watch List notes:

XIN: Wang Mang, 7-23 AD, AE key money (21.31g), H-9.13, qi dao wu bai (inscribed knife [value] five hundred), VF, S. Wang Mang was a nephew of the Dowager Empress Wang, and during his time as her regent he usurped the throne, and founded the Xin Dynasty. He introduced a number of currency reforms which met with varying degrees of success. The first reform, in AD 7, retained the Wu Zhu coin, but reintroduced two versions of the knife money: the value 500 and value 5000 types which were cast from AD 7-9.

Estimate: 500-700 USD