Kwangmyongsong-4 (Korean for Bright Star-4 or Lodestar-4) or KMS-4 is an earth observation satellite launched by North Korea on 7 February 2016.  The launching agency’s acronym NADA is remarkably similar to someone else’s, and has an unfortunate connotation in another language, but there you go.  This is an unused “domestic” postcard, captioned only in Korean.  Grade: 1