Could this be remotely possible? A March 31, 1974 use of an 1862-71 10 cent Inland Exchange revenue.

Because I have more points below in favor of genuine use does not mean I personally favor that.
In favor of a genuine illegal use:
1. I think (but am not sure) that ten cents was the correct first class postage for the date.
2. It is a definitive size stamp and blue was the color of the newly issued Scott #1510 for the period.
3. It is tied to the cover.
4. A person who knows nothing about revenue stamps could have found an old revenue and put it on the cover.
5. Other modern use of stickers or other non postage stamps were applied to covers, processed by automated equipment and delivered to addressees.
Not in favor of a genuine illegal use:
A. It was a 100 year old stamp at the time. (This is really a weak argument considering point 4 above.)
B. The tied cancel is questionable. (Or is this possibly a carrier applied cancel?)
C. Unfortunately the cover obviously went through the canceling equipment upside down or my original question would be unneeded.