1878-83 Large Dragon thicker paper, rough perf, 2 1/2mm spacing, 3ca brown-red with large part "Amoy Customs Mail Matter" oval in red, a scarce use as this mark was intended for use on stampless official mail only (Image)

1878-83 Large Dragons, thicker paper, 2 1/2mm spacing, rough perf., 1ca green, 3a vermilion and 5ca chrome-yellow, each used by part to large Peking seal in blue, small thin on 5ca, otherwise fine to very fine trio (Image)