nice placement of the cancel. i wonder if there are machines that are now trained to find the stamp and send the cancel to that space.
The cancel is interesting, you're right. I think machines can only put cancels on the corners, but I suppose there must be some slippage every now and again from regular mail I've received.While not in the usual place, it looks like a machine cancel rather than a hand cancel. I'm sure it will remain a mystery forever.