1928-33  Air Mail

5c - Carmine and blue
Engraved - Perf. 11 - Scott #C11 - 1928

5c - Violet 
Engraved - Perf. 11 - Scott #C12 - 1930

65c - Green 
Engraved - Perf. 11 - Scott #C13 - 1930

$1.30 - Brown 
Engraved - Perf. 11 - Scott #C14 - 1930

$2.60 - Blue 
Engraved - Perf. 11 - Scott #C15 - 1930

5c - Violet
Engraved - Perf. 10 ½ x 11 - Scott #C16 - 1931

8c - Olive Bister
Engraved - Perf. 10 ½ x 11 - Scott #C17 - 1932

50c - Green
Engraved - Perf. 11 - Scott #C18 - 1933