Japanese Copper rods salvaged from the VOC ship the Waddinxveen: these were used to make emergency copper ""coins"" small ones: and larger ones: some Roman Republic shell money:
I have two Roman "aes formatum" except they are lead in the shape of cast cockle shells... not sure if that means they also served as currency? They are about 3/4" in diameter...
AE SQUARES Indian AE Square Fractional Karshapana punch 125 BCE 9.0x8.2mm 0.86g Ominus1 CHICKETS from ASHOKA India Maurya ser VIB AR Karshapana punchmark 270-175 BC ASHOKA SILVER BARS (Cat Tongues?) India Gandahara AR Bent Bar 11.3g 650-600 BCE long early type RARE two dots - also have on BOTH sides VERY RARE