The place to look first is at the lock of hair behind George Washington's ear, unfortunately not shown. If the bottom hair is much shorter, the stamp is type I. If the bottom hair is slightly shorter than the top hair, the stamp is type II. The bottom hair is longer if the stamp is type III. Look at detail area number 9 in Stamp Smarter:http://www.stampsmarter.com/1847usa..._03main.htmlhttp://www.stampsmarter.com/1847usa...k/2cA09.html
I wish the 1847USA site had more links. I believe that the 2cT01_03main page is the most useful page on the entire 1847USA site, but it is sometimes hard to find, a problem inherited
from the original site.
The other places to look are area 2, the ribbon, and area 6, the lines under George Washington's ear. The gap below the ear is especially important for identifying rotary press type I coils.
Color and perf hole size can also help identify some early rotary press coil.
The color of the stamp on my monitor suggests that it is type II with a watermark. Unwatermarked type II horizontal coils are extremely scarce and don't seem to exist in any of the brighter shades seen on watermarked type II stamps. Type I watermarks are usually easy to see.
Later printings of type III coils are sometimes confused with other types because too much ink was wiped from the plate leaving some lines unprinted or partially printed.
First, determine the stamp format (sheet stamp, horizontal coil, vertical coil or booklet pane. If the stamp is a coil, determine if it is a rotary press coil by comparing the size of the design with a sheet stamp. Alternatively, if the 2¢ stamp is not type I, it must be rotary press. Coil waste stamps, Scott 538, 539 (type II), 540 (type III) and 541 are perforated 11 x 10 from broken coil rolls or fragments too short to strip into coil rolls. The Stamps you are looking at could be 453, 454, 455, 491 (almost impossible), or 492. If the stamp is type I, it must be Scott 453. If it is type II, it is most likely a Scott 454 with a faint watermark. Scott 491 is scarce and Scott 439 is very scarce.