NiJeLe,
What you describe with your 1 cent Washington coil sounds like typical damage caused by an
affixing machine similar to these two coils from the previous definitive series shown here. It is
not a production or postal error, but done instead by the consumer using an affixer slightly out of adjustment. These mis-cuts will not be listed in any catalog and are considered damaged by most collectors, even they show typical "postal history" use characteristics of the application technology of the era.

Add: Here is a Scott 839 with a miscut by the application machinery. Value is essentially zero.
