This ink bleeding is common and normal for this US stamp and many engraved US stamps of modern times. The press prints the colors in one pass/run through the press. Very severe examples of crossover/mixing of ink colors are probably removed for destruction but not always. Perhaps one of the printing press experts here can tell us the type of printing press(es) used.
Here is a later issue showing the same effect on another US stamp, including a couple of more extreme examples:http://goscf.com/t/77709
The phenomenon is also seen on French and French Community multicolor engraved issues from at least the 1950s forward.
You are welcome to send this to the Philatelic Foundation, but personally, I would prefer to save the money.