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Machin Singles with Imperforate Sides (page updated: Oct 4/03) A few Machins that come from certain booklets have one or two straight sides (imperforate) rather than being cut down the center of the perforations. Many collectors "hate" stamps with a straight edge and refuse to collect them. However, it is these kind of stamps that prove very easily where they originated from. There are 8 possible positions available for imperforate sides. However, 2 of these positions have not yet been seen on Machin stamps. Imperf Left & Top Imperf Top Imperf Top & Right none 14p dark blue 19p flame 27p rust 29p purple 31p ultramarine 33p emerald green 39p amethyst 15p Anniversary 20p Anniversary 1st black 1st flame 2nd light blue 2nd dark blue 14p dark blue 19p flame 29p purple 15p Anniversary 20p Anniversary 1st black 2nd light blue   Imperf Left   Imperf Right   1p crimson 2p deep green 5p greyish rose 13p light brown 14p dark blue 17p dark blue 18p grey green 19p flame 20p black 24p rust 20p Anniversary 2p deep green 13p light brown 18p grey green 19p flame 20p black 22p flame 24p rust 20p Anniversary   Imperf Left & Bottom Imperf Bottom Imperf Bottom & Right none 14p dark blue 19p flame 27p rust 29p purple 31p ultramarine 33p emerald green 39p amethyst 15p Anniversary 20p Anniversary 1st black 1st flame 2nd light blue 2nd dark blue 14p dark blue 19p flame 29p purple 15p Anniversary 20p Anniversary 1st black 2nd light blue