Hi Hans,

 

The scan below shows 12ore print 17 pos. 55. The two markings are constant in the Museum sheets and I also have a couple of used copies with the flaws. For my notes I have temporarily called it OF106.

 

I have not checked any other printings for this 'oval flaw' so perhaps if others have found it on other sheets I would be pleased to know about them.

 

Regards, Ed