The Little Rock Shield was first used in September, 1830.
  Examples are known used until June, 1832. 

The Postmaster at the time was Dr. John T. Fulton,
He was appointed February 8, 1830 and served until December, 1831.
He was appointed again in August, 1835.

The 28 reported examples of the Little Rock Shield are as follows.
Illustrations have been collected from auction catalogs, exhbits, and covers scanned directly
The first usage, on September 9, 1830, is the "Type 1" with the shield contained in a square "box".
Either the results were not pleasing to Dr. Fulton, or the device broke.  After Sept 9,
all usages are missing the upper square.
All strikes are in black except for the use on Sept 30, 1830 which was done with red ink.

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Updated 2012-10-14