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Type 61: Overprint And Precancel Problems
Type 61: Scott Canal Zone 91c is a variation of Scott Canal Zone 91, with the overprint shifted vertically such that overprint reads "ZONE CANAL" instead of "CANAL ZONE". This stamp is an overprint of Scott 623.
Type 61: Two precancel varieties for Scott 1384a: The left stamp shows no trace of precancel on front. The right stamp's precancel is reversed and shifted lower.
The July-September 2004 issue of The EFO Collector (Vol. 23, No. 6, pp. 24) contains an article by Stan Goldfarb that describes many varieties of Scott 1384, including many precancel varieties, and is profusely illustrated.
