With the threads on 1851 Imperfs and Perfs, I thought I'd add a new one with a few examples of post-1861 demonetization use of the 1857 issue (due to stocks of the stamps remaining in the South post-secession and the desire to make sure they weren't able to monetize the remaining stamps).
Please feel free to add any others to the thread.
Here's one from Leominster, MA:

and here's one from Little Rock, AR:
