DPR Korea North: Specimen airmail labels

Here are 3 specimen cards of priority airmail labels from North Korea! 2 cards are for airmail and 1 for registered post. I was trying to find some more info of those labels but couldn't. There are 6 strips, i believe stamps and small airmail/registered labels. Each card is individually numbered on backside.

Year: 1996, Self-adhesive. Günter Mair's catalogue no: - KRN-A-3, rouletted VR, HL and/or HU
(narrow steps), size: 16x9mm, top and bottom labels have one corner rounded others are square, 
Dark blue/white, 2** 

Year: 1996, Self-adhesive. Günter Mair's catalogue no: - KRN-A-?, violet-blue/white, 2**

Year: ?, Self-adhesive.