For paper variety specialists, two colors of paper were used to print the stamps for both Alexandria and Baltimore and three colors of paper were used to print the New York provisionals. Saint Louis stamps were printed both on a greenish paper and a gray lilac paper plus some on a thin pelure paper, which stamps are seldom found. Approximately a half dozen New York provisionals have a large double line watermark showing parts of the letters “J” and either “E” or “F”. Paper folds are found on the New York and Baltimore adhesives. The colors of paper used for the Baltimore and New Haven stamped envelopes varies extensively and some authorities believe that some and perhaps all of the envelopes, were furnished by the postal patrons, who, took the envelopes to the post office and had the clerk emboss their envelopes with the requested rate. The clerk would then collect the correct fee from his customer.
The printing of stamps with two different denominations on one plate gives rise to the possible discovery of se-tenant examples. There are many se-tenant unused pairs and large multiples including full sheets of the Providence 5¢ and 10¢ stamps. No used 10¢ examples are known and there are no used or unused se-tenant pairs recorded from Baltimore. The only known se-tenant stamps come from Saint Louis where there are two recorded 10¢–20¢ se-tenant multiples (one on cover) and three recorded 5¢ –10¢ se-tenant multiples. All five of these se-tenant examples are used.
Siegel Encyclopedia Brattleboro VT
Siegel Encyclopedia 1845 New York