RT19 USA #26 tied by the Montgomery, Ala CDS 26 MAR 1861. “Confederate States of America Post Office Department” imprinted envelope Dietz Type I. Addressed to Hon David G. Burnet, Galveston, Texas. Receiving period pencil docketting at the left indicates the contents were from J. H. Reagan (CSA Postmaster General). Cover is dated only 20 days after Reagan took office as Postmaster General and represents a paradox as a CSA Post Office Department cover was carried by the US Postal Service. This is in the USA Used in the CSA period, so CSA free franking did not apply, and the USA postage had to be paid. This cover is referenced on Page 171 of the New Dietz 1986 Edition as the Earliest Known Usage of a CSA Post Office Department Imprint Cover. Backflap missing and very slightly reduced at the top, but otherwise very Fine. An extremely significant item of CSA Postal History. SOLD