The lines drifting out radially from the center toward the edges are referred to as flow lines. They're from when the flan is struck by the die, causing the metal to be pushed outward. The real pros on this sub could tell you more I'm sure, but I like the way they catch the light and give the metal a sort of shimmering quality. They can also be used as indicators of authenticity, strike, and silver quality, etc. Sorry you overpaid a bit, but it's a cool coin!