Hello there! Sorry, I don't have a good stamp catalogue yet. So let me ask you, is this perforation common or is it a mistake? Would it make a difference in the value? Any idea on the value? Comments welcome!
When these stamps were printed they were produced in large sheets that then were divided in smaller panes, Your stamp was the upper most right hand stamp of the bottom left pane. And to most collectors this is looked at as undesirable.