It is not unusual in Romanian philately to find flaws created by paper folds in the printing process.
Printers waste or rarities.....anyway, here´s a selection

paperfolds1.jpg (11201 bytes) paperfolds2.jpg (9310 bytes)
paperfolds3.jpg (19778 bytes) paperfolds4.jpg (22316 bytes)
paperfolds5.jpg (14290 bytes) paperfolds6.jpg (14022 bytes)
paperfolds7.jpg (15136 bytes) dmc5-2.jpg (7609 bytes)
partial1.jpg (8985 bytes) partial2.jpg (6544 bytes)
partial9.jpg (8433 bytes)
   

Collection of Dr Ing. Marcel Sapira:

Display 1 Display 2 Display 3 Display 4
Display 5 Display 6 Display 7 Display 8
Display 9 Display 10 Display 11 Display 12
Display 13 Display 14 Display 15 Display 16

Also, an example of how it looks when the support cylinder fell away

1940flaw.jpg (9206 bytes)