Webster 15 Cents.1870-1875.

First look at these stamps with the longer perfs on the right,thought it was a repaired stamp. At the back there is no signs of extra paper sticked neither sign of damage and repaired. Any opinions feed backs will be much appreciated.Am also trying to determine the scott# of this stamp.Seem difficult as it is based on colors of bright orange,yellow an red orange.Would be helpfull if someone could give me a guideline as to enable me to assertain the scott#. Its a perf 12.Thanks.

This is a double-paper variety Sc#163c

The following is an extract from http://www.1847usa.com/1870identifier.htm#double paper

"Double Paper: The double paper was described by John Luff as being composed of two parts: a "very thin paper, backed by a thicker and firmer one". In theory, the "impressions were to be made on the thin paper which, it was expected, would be destroyed by any attempt to remove a cancellation." (Burns, U.S. Specialist March 1999). This was not always the case, however, since impressions were at least sometimes made on the thicker paper. The collector should bear in mind that the Bank Note double papers are composed of one thick paper and one very thin paper.

The thirty-cent stamp is also interesting. In 1989 Jack Rosenthal published an article in Linn's that showed a clear alteration in the triangular protrusions in the "S" of "CENTS" on some of the American printings, that is Scott 190 and Scott 217. Not all American printings show this alteration, or "secret mark" if you choose, however if the alteration is present the stamp must be an American printing. The American printings were on a soft porous paper making them easily identifiable in any case, but it may help in weeding out Continentals printed on the soft, "transitional" paper. The Micarelli guide lists the Continentals on "soft white" paper, but it is not listed here to prevent confusion."