15 Kreuzer ochre coarse perforation mixed franking with 10 Kreuzer blue fine perforation, mixed issues from Vienna to Hermannstadt, arrival 17.5.64 on reverse, three red "RECOMMANDIRT WIEN 14/5" strikes, stamps originally attached to folded letter, two 15 Kreuzer on front, blue 10 Kreuzer on reverse paying registration fee, correctly rated registered second-weight-step letter, outstanding condition, very rare stamp combination unknown to Ferchenbauer specialised catalogue, Arnold Goller photo certificate (2018)