As I've said before, the majority of the Beatrix coil stamps have imperforate sides. This means that the coil sheets are only perforated horizontally and then cut vertically. Now you wouldn't notice this on properly cut stamps but Enschedé (the printer) have removed every pin in between the columns of stamps (the bit where the coils are cut). I suppose this is done to prevent the coils from tearing too easily. It is a sign of craftmanship I think (for which Enschedé seems to be known), for what would be easier then to just have complete horizontal rows of perforating pins and not bother with removing the pin in between the stamps!
But even at Enschedé some things can go wrong, so on this slightly miscut coil the "missing perforating pin" is very clear to see!



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