Proof 1969 (July) Explorers of Arabia, five sets of four imperforate proofs on presentation cards, three with the 1r. printed in emerald-green and blue, one set marked "As submitted 5-12-67", another with the 35d. and 60d. values with manuscript alterations, the other two showing the 35d. and 60d. value tablets altered and with the 1r. printed in deep green and blue, one marked "As submitted 17-1-68" and both marked "Approved - letter 3/2/68". A fascinating group.