The plate number typically appears as one or more small digits in the margin at the bottom of the stamp.
The plate number may be centered or, on some coil issues, located toward the right.
In the case when a letter is represented in the plate number, an upper case letter usually appears at the beginning or at the end of the sequence with the former serving as a good identifier of the stamp printer.
[2] Collectors specializing in PNC collecting typically save plate number coils in the following formats: Some coil issues will require collectors to save longer than even the PNC5 mentioned earlier.
For example, the United States Crops coil stamps, issued in 2006, have five designs with only one of the stamp designs bearing a plate number.