I couldn't help myself. This one was described as having a blue cancellation. It has a black cancellation. I believe the blue is an ink smear, not a cancel. Most every cancellation I have seen can be discerned with some kind of pattern, but not this one.
The blue ink is the same color as the stamp ink and I can't detect any pattern even with a 30x glass. The smear covers nearly the whole stamp and appears to be under the black cancellation itself. I'm open to opinions of others who can see more to this than I.
Art
