US #1690 Franklin Color Shift Error - 1976 Mint Blue Color Shift Upward

This Bicentennial issue was printed by two processes: a multicolor offset for the map and background color, and a dark blue engraved color for the bust of Franklin and the map inscriptions. This dramatic 4mm upward shift of the engraved blue color moves everything northward – Albany is now in Canada, Boston is in northern New Hampshire, and Philadelphia moves to upstate New York! US #1690 Ben Franklin color shift