1901 - 1945 SPECIAL DELIVERY
ISSUE OF APRIL, 1911
Watermarked Single Line USPS (191). Perforation 12.

E3: Deep Ultramarine
ISSUE OF 1916
Watermarked Single Line USPS (191). Perforation 10.

E4: Deep Ultramrine

E4a: Pale Ultramrine
ISSUE OF JANUARY 11, 1919
Unwatermarked. Perforation 11.

E5: 20c Ultramarine

E5a: Pale Blue

E5b: Dull Violet