China, 1761 AD., Qing Dynasty, emperor Gao Zong, Peking, Board of Revenue Mint, 1 Cash, Hartill 22.205.

China, Qing (Ch'ing) dynasty (1644-1911 AD.), emperor: Gao Zong (Kao Tsung) (1736-1795), reign title: Quian Long (Chien Lung) (1736-1795), Peking (Beijing), Board of Revenue mint, transitional type C, no date, issued 1761 AD. (?),
1 Cash (23 mm / 4,20 g), cast brass, square center hole, medal alignment ↑↑ (0°), smoothed edge,
Obv.: 乾 隆 通 寶 , four Chinese characters, reading from top to bottom and right to left: Quian Long Tong Bao (Ch'ien Lung Tung Pao) , square head Tong with more or less horizontal bottom stroke, open "bei".
Rev.: ᠪᠣᠣ - ᠴᡳᠣᠸᠠᠨ , "Boo - Ciowan" , large Manchu, round head "Boo", the Manchu character boo to the left of the square hole, which means "building", used as a transliteration of the Chinese character bao (宝) which means "treasure", right: Manchu "Ciowan" - name for the Board of Revenue Mint, Peking.
Hartill p. 297, no. 22.205 (or 22.207 ? (type C) (rarity level 15, very common) ; Schjöth 1464 var. ; FD 2297 var. ; KM 387.1 var. .

Type variations:
Type A: Well made coins, large Manchu
Type B: 乙 radical in 乾, マ radical in 通
Type C: 乙 radical in 乾, コ radical in 通; round head ᠪᠣᠣ
Type D: Z-type 乙 radical in 乾, コ and slanting 辶 radicals in 通; protruding head ᠪᠣᠣ
Type E: 乙 radical in 乾, コ and slanting 辶 radicals in 通; round head ᠪᠣᠣ
Type F1: し radical in 乾; cursive ᠴᡳᠣᠸᠠᠨ
Type F2: し radical in 乾; gap between oos in ᠪᠣᠣ
Type G1: し radical in 乾; protruding head ᠪᠣᠣ
Type G2: し radical in 乾; crude text; broad rims

(posthumous issues: 缶 radical instead of 生 in 隆):
Type H1: vertical dots 辶 radical in 通
Type H2: oblique dots 辶 radical in 通
Type H3: horizontal dots 辶 radical in 通

Privy marks:

East branch (D-H2): Radical 貝 in 寶 has 6 strokes
East branch (H3): six stroke 貝 radical ; マ radical in 通
South branch (D-H2): Top vertical stroke of radical 車 in 乾 is slanting
South branch (H3): コ radical and two dot 辶 radical in 通
West branch (D-E): stroke linking both コ et 用 radicals in 通
West branch (F1-H2): Middle stroke protrudes from 用 in 通
West branch (H3): マ radical and one dot 辶 radical in 通
North branch (D-G): Left protuding top of radical 阝 in 隆
North branch (H1): no privy mark, コ radical in 通
North branch (H2): protruding head ᠪᠣᠣ, コ radical in 通
North branch (H3): protruding head ᠪᠣᠣ