Having some trouble nailing these down. Any help regarding country of origin and approximate date range at the very least is much appreciated, thanks :)
Top left: Vietnamese "Minh Mang Thong Bao" from 1820-1840. Top Right: Chinese "Qian Long Tong Bao" from 1736-1795. Far Right: Chinese "Yuan Feng Tong Bao" from 1078-1085. Bottom Right: Chinese "Guang Xu Tong Bao" from 1875-1908. Bottom Left: Vietnamese "Dai Tri Nguyen Bao" from 1358. I have never seen one of these before, and I expect it to be the most valuable coin in this lot.
This was apparently only made in one year, because the mint director got a royal slap on the hand for breaking tradition and taking the liberty of... *gasp* putting the denomination on the coin!
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