To further reduce printing costs, on August 19, 1931, the Post Office department issued a second violet 5-cent airmail stamp with the winged globe design, this one printed on a rotary press. No ceremony took place because the post office did not consider it a new issue. This issue was perforated 10 ½ by 11.
Although the C12 and C16 stamps are the same color, they are easy to distinguish through different perforations and the gum breaker bars on the second issue. Further, the rotary press eliminated the straight edges found in the flat plate press version (see also C17 and C24).