22c Locomotive, Blue Omitted (2366c). Imperforate at sides and at bottom, wavy-lines machine cancel, short perf at top, otherwise Very Fine, an extremely rare used example of this distinctive error, with 1995 A.P.S. certificate, Scott Catalogue lists but does not price this error in unused condition, they do not even have a dash for the used, Datz catalog notes "possibly unique"

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