This was a Printing Experiment: Stamps were printed in various colors, (the first production of the Postal Printing House's press), perforated 111/2 x 11 or imperforate.

The following are the known Printing Experiment stamps in circulation:

Perforated and Unwatermarked: yellow-green, purple, deep rose-red, olive, blue, light blue, and vermilion.
Perforated and watermarked Eclipses: vermilion, bright blue, steel blue, purple, rose-red, and olive.

Imperforate and Unwatermarked: light blue, vermilion, yellow, and pink.