Santa Ana, California. $20 1902 Date Back. Fr. 643. The Farmers & Merchants NB. Charter #7980. PCGS Currency Very Fine 20 PPQ.From our own backyard in Orange County, California, this attractive 1902 Date Back $20 from the Farmers and Merchants National Bank of Santa Ana, California is the finest of three known. Grading VF 20 PPQ, it shows better than its grade might suggest, with outstanding centering, razor-sharp pen signatures, attractive off-white paper and just honest wear from circulation. An extremely scarce bank, represented by only five known notes in any size or denomination.