If you happen to have a stamp that is heavily cancelled but still can recogize the position of the 2 lower right hand dots (ie dot after NOV and dot after CREVIT) in the legend section then this page can possibly help you to refine your quest for a plate position.
There are 3 possible ways in which your stamp will match.
You will either have:
1. a reproduction from an essay sheet. Essay's were proposed designs which needed approval prior to printing for circulation and not considered as a viable legitimate stamp.
2. a genuine stamp issued for circulation and approved by the Postmaster General.
3. a very good forgery or fake (a genuine stamp which has been physically altered).