(a) inscribed (vertically) in pencil on reverse u.r.: C1 (b) inscribed (vertically) in pencil on reverse u.r.: B1 (c) inscribed (vertically) in pencil on reverse u.r.: A1 (d) inscribed (vertically) in pencil on reverse u.r.: C2 (e) inscribed (vertically) in pencil on reverse u.r.: B2 (f) inscribed (vertically) in pencil on reverse u.r.: A2 (g) inscribed (vertically) in pencil on reverse u.r.: C3 (h) inscribed (vertically) in pencil on reverse u.r.: B3 (i) inscribed (vertically) in pencil on reverse u.r.: A3
