Sorry to be the Boo- Bird, but I just don't like the colour, the denticles, the surfaces, and some details around and in the characters. These pieces varied from fairly good silver (0.800) down to billon- 0.100 to 0.300 fine, so silver content alone is not the only distinguishing feature. Yunnan 50 Cents ND (1920-1949) Y257.3 which is supposed to have a large circle around the inner circle of the rosette was the 2 circle under the sun 1949 issue. Earlier issues had 3 and 4 circles under the sun below the dragon.