From Thomas Jefferson Encyclopedia
Pictured to the right is "one of Jefferson's seals," according to his grandson-in-law Nicholas Philip Trist, bearing the motto, "Rebellion to tyrants is obedience to God." Jefferson's Memorandum Books contain the notation, "Pd. Thomson for a seal £3-7" on 26 March 1786; this may refer to the purchase of this seal. The first known intact copy of the seal is on a letter to Richard Gem of 4 April 1790.