One stamp in a 150D nominal was issued on December 31st, 1958 in perforation 12. This was the last stamp that was denominated in Old Dong.
Here is the mint stamp
Here is the cancelled to order stamp
Hers is a postally used stamp. Postally used stamps are at least ten times rarer than cancelled to order stamps.
Here is a mint pair that shows a significant perforation shift.
Registration Nr. 100170