Silver Hammered Coinage, Nguyen Dynasty (1802-1945), Emperor Tu Duc, Nguyen Phuc Hong (1829-83), 4 Tien, ND(1848). 15.09g, 0.8000 Silver, 32mm (Note: 4 Tien = 40 Phan Zinc or Brass cash coins). Obv.:'Tu Duc Thong Bao'. Rev.: 'Su Dan Phu Tho' (Enable the people having wealth and longevity). This type is more than 60% undervalued in Krause. EF for issue. Choice EF. Scarce. Ex Jules Silvestre collection.