Looks like Scott# 720 issued June 16, 1392. It could be either Deep Violet or Light Violet. I'm not even going to guess at the color. That's way beyond me.
Also, if I'm not mistaken, the holes mean it is considered a 'perfin'. My understanding is that holes were put in the stamps, usually as a name or initials, to discourage theft.
smauggie beat me to making a joke about the wrong year.
I'm not a US expert but that doesn't look like a rare stamp. It is the perfin, as barstoll says, that may add value to it. (PERForated INitialS or INscriptionS (see Germany).
If the stamp is still on the whole envelope, DO NOT REMOVE IT. Used stamps on "cover" (original and complete envelope) are more valuable than used stamps on cut corners or totally removed.
That said, this stamp on cover is not going to be very rare unless the cover itself is addressed to a historical figure or mailed to, through, or from a place of historic interest.
The perfin on this stamp looks like the small CE/Co perfin used by the Commonwealth Edison Company of Chicago from 1902 to 1965. It's given a rarity rating of "E", just one step less common than "F", the most common rating used.
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Posted 11/25/2010 2:15 pm
there just as quick to jump on me too and yes we all make mistakes 
so don't worry as the next time you'll do better.
