San Antonio, Texas. $50 1902 Plain Back. Fr. 682. The Frost NB. Charter #5179. PCGS Very Fine 25.This $50 1902 design is often underrated as the 1882 notes of the same denomination just have a strong visual impact. None the less these notes are scarce with any charter considered and attractive problem free examples such as this Frost National Bank of San Antonio are quite the treasure.