(i): signed with the artist's initials and dated 'J.D. 65' (lower right); dated '15/4/65' (on the reverse), (ii): signed with the artist's initials and dated 'J.D. 65' (lower right); dated and numbered 'H 178 9/5/65' (on the reverse), (iii): signed with the artist's initials and dated 'J.D. 66' (lower left)