Unused American Express Company traveler's check in the amount of $20, 6.75 x 2.75, no date but circa 1960, boldly signed along the top, "Greta Garbo." In fine condition. Encapsulated in a PSA/DNA authentication holder. According to her grand-niece, Garbo used American Express traveler's checks when traveling. In the 1970s, she was offered a million dollars to appear in the iconic American Express advertising campaign: 'Do you know me?' She declined.