Silver certificates are no longer in circulation and have been replaced by Federal Reserve notes. As such, they have no face value and are not worth anything more than their historical or collectible value. The value of a silver certificate depends on its condition, rarity, and demand among collectors. Factors that can affect its value include the series, denomination, signature combination, and condition.
Without examining the specific certificate and considering these factors, it is not possible to provide an accurate valuation. However, on average, a 1957B silver certificate in good condition may be worth a few dollars to collectors, but it is unlikely to be worth a significant amount.