Unlike collectible silver coins, the silver bar industry is straightforward. The value is dictated by the purity and weight of the silver bars. We generally do not recommend paying a higher premium when buying silver bars that are produced by any specific “brand name” producer. We also do not recommend paying extra for bars with a serial #. It just isn’t going to matter much to dealers when it is time to re-sell so the extra premium may be wasted. As long as the silver bar is in good marketable condition, carries a stamp with its weight and purity, and is made by a recognized producer, little else matters.

https://www.moneymetals.com/buy/silver/bars