Miracles happen, and as of this writing, the minaret (official name:  Great Mosque of al-Nuri (جامع النوري) ) is still there.  Perhaps built in 1172, it is one of so many structures under severe threat.  This unused postcard is aging and with minor staining on the reverse, but still we assign Grade: 2.  (UPDATE on 23/6/17:  the miracle did not last and the mosque is now gone.)