The 1851/57 3¢ Washington
IDENTIFYING THIS STAMP
If it has no perforations then there is a 90% likelihood that it is number 11, otherwise it is one of these. If it has perforations it will be either number 25, number 26 or number 26A, otherwise it is one of these. The difference between one number and the other is the color. They are all different shades of brown, some are plum in color, some err more towards orange-brown. Due to oxidization of the colors and fading in sunlight, it becomes difficult to discern one color from another.
VALUING THE STAMP
With the stamp without perforations (imperforate), the value is quite dependent on how well it was cut. If you see the design clear of the edges on all four sides then you have a more valuable stamp. If, on the other hand the stamp was cut a third of the way into the design, the value will be less.
THE RARE REPRINTS
This stamp was reprinted in a scarlet color (shown above) on hard white paper in 1875 and it can be found by clicking here. The odds of finding one are very slim and they require a certificate to verify its identity.