In 1903 Serbian king Alexander I and his queen were murdered in their palace. Alexander’s successor, Peter Karageorgevich, rescinded postage stamps bearing the dead king’s portrait and marked his own coronation with this stamp, depicting twin profiles of himself and his ancestor Black George, a Serbian patriot:

If he’d hoped this would allay suspicion, he was mistaken. In Through Savage Europe (1907), writer Harry De Windt notes that when the stamp is turned upside down, “the gashed and ghastly features of the murdered King stand out with unmistakable clearness”:

That’s a bit overstated. Here’s Alexander’s original stamp and the purported “death mask” — gaze at it blankly and Alexander’s features will emerge from the noses, brows, and chins:

“Needless to state, the issue was at once prohibited.”