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Schjöth 1419, Hartill 5.34-38 Type B4, KM --
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Kangxi (1662-1722)
1 cash, 1680[?]-1690s[?], Board of Revenue mint (in Beijing), 23 mm.
Cast Bronze (officially 60% copper and 40% zinc, but actually on average 60.7% copper, 30.1 % zinc, 6.6 % lead, 1.3 % tin, etc.), nominal weight 1.0 qian = (3.73 grams) but an actual weight of 3.4 grams or less.
Obv: Kangzxi tongbao.
Rev: Boo Chiowan to the left and right.
Type B4 is comprised of small crudely-made coins with a broad bei and a square headed tong, right protruding, normally with a protruding head boo. Type B coins do not lend themselves to easy classification.
Hartill rarity 10
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