Gold streaks on Olympic Gold Medal stamp sheet

A friend showed me this recently so I scanned it for display here.

(click on the image for a much bigger one)

If these were printed in photogravure we might suggest that these marks are a doctor-blade flaw, but this are litho, and there are several marks.  It looks to me similar to the drag marks that I get on my desk-top printer when there has been a problem with printing.

I understand that the original finder has several like this and the extend over the whole A4 sheet.  The colour affected is the gold, so it is from the original Walsall printing and is under the Olympic images.

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