This rather grotty specimen arrived today, which had I spotted on Hipstamp. I've seen examples of double perforating before but not a 'half double'. It appears to be progressive too, in that each row advances to the right by a fraction:
Here's a close-up of the perfs between the second and third stamps:
So all you world-wide collectors, do you have any examples of this anomaly? Is there a philatelic term to describe it?
Even better, does anyone know HOW this could occur?
 
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