C61 CSS 100 in full sheet of 100 (5 x 20) with faint Shanghai cancels, containing two "crack in left horizontal stabilizer" CSS AM 100b at pos. 30 and 80/100, perf. separations

C61 CSS 100 in full sheet of 100 (5 x 20) with faint Shanghai cancels, containing two "crack in left horizontal stabilizer" CSS AM 100b at pos. 30 and 80/100, perf. separations