9N11v, CSS SN13 variety, 1942 Shanghai-Nanking $1 on 8c Olive Green Chung Hwa Dr. Sun Yat Sen imprint block of nine, "c" secret mark, top row middle stamp

9N11v, CSS SN13 variety, 1942 Shanghai-Nanking $1 on 8c Olive Green Chung Hwa Dr. Sun Yat Sen imprint block of nine, "c" secret mark, top row middle stamp