Two Manchu words (read vertically) separated by the hole.
Reverse script
Mongolian / Manchu
Reverse lettering
ᠪᠣᠣ
ᠴᡠᠸᠠᠨ (Translation: Boo-chuwan)
Edge
Smooth.
Mint
Mintage
ND
(1796-1804) - Hartill#22.538: Closed six-stroke Bei - ND
(1805-1817) - Hartill#22.539: Open six-stroke Bei - ND
(1818-1820) - Hartill#22.540: Seven-stroke Bei with horizontal -w- in Yuwan - ND
(1818-1820) - Hartill#22.541: Seven-stroke Bei with slanted -w- in Yuwan -