Must have gone through the mailing machines without being noticed. Another example of a 25-cent loss to the US Postal Service, although, as has been suggested several times in the past, the cost to return the letter to sender for additional postage probably costs more than just letting the mail go through like that.
Interesting that the stamp is the 20-cent Washington coil variety. I also like the four line spray on cancel. Not nearly as common as the five line spray on variety.
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