The oldest brick in existence, dating from the Fortieth Century, B. C., was shown by Mr. Henzey, the keeper of the Louvre, in Paris, to members of the Academie des Inscriptions et Belles-Lettres. This brick was discovered during recent excavations at Tello, in Chaldea [present day Iraq and Kuwait], by the French antiquarian De Sarzee. The brick was somewhat curved and had been burned. It bore the mark of the maker’s thumb.

Source:

Brick and Clay Record
Volume XIX, Number 6, December 1903
Windsor & Kenfield Publishing Company, Chicago, IL
Page 209