The orange vermilion ink and the Continental Bank Note Company secret mark differentiate this 7-cent Stanton stamp from the National Bank Note version of the same that was also printed in vermilion. The secret mark is easily found near stamp's small, almost complete circle in the bottom right corner. Where the ends of the lines come close to closing the circle, the secret mark is the two semi-circles around the bends of those lines.
The 7-cent Stanton was not available after 1875 because the Universal Postal Union standard international single-weight five-cent rate had been adopted. From 1871 through 1875, however, the stamp paid for an increasing number of single rates—for example, the 1871-1872 rate to England and Denmark and the 1873 rate to Hungary and Luxembourg. Continental Bank Note Company printed approximately 2,500,000 stamps of this 7-cent issue.