Fort Plain, New York. 1902 Date Back $10-$20 Fr. 616/642. The Fort Plain NB. Charter #2860. PMG About Uncirculated 55. Uncut Pair. An uncut pair of $10 & $20 Date Backs from this Montgomery County issuing bank. Seen with excess selvage at bottom. Dark blue overprints remain bold and appealing, along with penned signatures.