Detroit, Michigan. $20 1902 Red Seal. Fr. 639. The First NB. Charter #2707. PMG Choice Uncirculated 64.Broad margins and bright, well embossed paper are exhibited by this crisp $20 Red Seal. The overprint inks retain vivid color while the penned signatures of bank officers Shaw and Ferry are sharply signed. This is an excellent example of this tough National Currency type.