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Color-omitted Errors
Whaaaat?
Science and Industry (left).  1983.
Girl Scouts (right).  1987.
Engraved black omitted (left stamp); all lithographed colors omitted (right stamp)
Scott Nos. 2031a and 2251a
Few can match the appearance of these two stamps for sheer oddness.  Fewer than 50 of each exist.
 
Elegant Understatement!
Cactus.  1981.
Dark brown omitted
Scott No. 1945b
In contrast to errors that leave one wondering the topic of the stamp is, this error is marvelously subtle; only the color used to accent the names of the cactus is gone.  Only 20 such blocks have ever been discovered. 
© Copyright 2010 and previous years by Stephen R. Datz. All rights reserved.