#5 Best matches I could find: China Shen Zong (1068-1085) should read Yuan Feng tong bao c/wise, or China Zhe Zong (1086-1100) should read Yuan You tong bao c/wise.
Number 1 is Japanese, I believe. Never been able to pick the eras on these properly. If it doesn't fly to a magnet (made of iron), t's either an incredibly rare modern coin (1840's) or a more common, older coin.
Number 3 is Vietnamese/Annamese, a 10 van coin of Thanh Trinh (1888-1907). Turning crusty green is a common fate for these coins.
Edited to add: Must... type... faster...
Waste no more time arguing what a good man should be. Be one. Roman emperor Marcus Aurelius, "Meditations"
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#4 Kwangsi Mint, emperor Kao-tsung KM# 411, Hartill 22.28? 1770-1794
What's the composition and diameter?
#1 Japan Shin-Kaneisen ~1700
Number 3 is Vietnamese/Annamese, a 10 van coin of Thanh Trinh (1888-1907). Turning crusty green is a common fate for these coins.
Edited to add: Must... type... faster...
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded one DPOTD.
Ebay auction with a similar piece.
2. China, Qing Dynasty, Daoguang Tongbao, 1821-1850, Guangdong mint, (Ding 2395)
3. Annam (Vietnam), Thanh Thai Thong Bao, 1888-1907 (Toda a13)
4. China, Qing Dynasty, Qianlong Tongbao, 1736-1795, Guangxi mint, (Ding 2293)
5. China, Northern Sung Dynasty, Yuanyou Tongbao, 1086-1093, (Ding 979)