Burma/Norp tiger tongue Currency: silver ingot 'Lats' (2, weighing 106gr and 124gr respectively), plus two smaller copper alloy examples, used mid-1,300s until late 19th century in the Mekong valley from Southern Yunnan to the Cambodian border; plus a Burma/Northern Thailand silver 'Nan Tok' (weight 60gr) with characteristic golden colouring to one side, caused by impurities; early-mid 1800s; also literature 'Curious Currency' by Robert Leonard, and 'An Ethnographic study of traditional Money' by Charles Opitz. (7 items)