The EFO Collector
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28. Gum missing from a full stamp, or present on the front of a stamp: Gum skips need to be collected in large enough blocks to assure that one can see where the gum starts and stops. Otherwise, a single stamp with gum washed off could be passed off as the error. Even when a block is offered, it is seen as a curiosity by most, and value is slight. The same is true for those few stamps that have been gummed on the front instead of, or in addition to, the back. The 1934 6¢ National Parks is known with gum on both sides.
Type 28: The Scott 745 shown above is gummed on both sides. This is not possible to see as displayed here, therefore an expertization certificate is useful.
Type 28: The Scott 963 block shown above has a gum skip that can be clearly recognized, because the edges of the skip are visible. The center horizontal row is totally without gum. The 2nd and 4th rows are also examples of Type 62, Gum Varieties.
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