The pattern is due to how the molten silver was poured into the bar. They've sanded the bottom to make it pretty, but you can still see the pattern. It's cool though - poured bars are slightly cooler and nicer than other bar styles (IMO). Brands don't matter too much but the one you've got it fine. I think it's a good purchase. Bars have low premium compared to 1oz coins like Maples and Eagles. Those have their own pros and cons of course. Silver atoms are a good thing though, diversifying into precious metal is wise to the max. Work your way up to 1/10th ounce of gold, perhaps? Prices sure are cheap right now. Fiat blows goats.