Laos, Lanchang, Circa. 1550 - 1570 Canoe Ingot / Lat, 1/2 Tamlung. First design, billon silver alloy, "canoe" shape ingot or lat was minted in Luang Prabang between the mid 1550's and about 1570. The denomination is 1/2 Tamlung and weighs 35.7 grams. !