Army of the Northwest overprints are interesting if only because of the enormous number of forgeries that are offered for sale. With the advent of
ebay, I notice that some new and dangerous examples are emerging.
I noticed one today - a clear overprint with the distinguishing dot very evident:

The dot is in the wrong place and all of the other distinguishing marks are missing, but it is an attractive piece and someone will bite.
The list price is $49, but they pay the postage - nice touch!
If others are interested, we can use this thread to evaluate other examples and expose forgeries.
Pochta