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Schjöth 1421, Hartill 6.25-28 Type B, KM 312.1
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Kangxi (1662-1722)
1 cash (cast brass), 1680s [?]-1690s [?], Board of Works mint (in Beijing), 23 mm.
Obv: Kangxi tongbao.
Rev: Boo yuwan.
Type B is comprised of smaller coins with a broad bei and a crude style. They have a nominal weight of 1.0 qian (= 3.73 grams), and an actual weight of 3.4 grams or less.
Hartill rarity 10
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