Switzerland: Swissair airmail labels

Airline issue labels from Swissair (Schweizerische Luftverkehr AG).

Year: 1947, Gummed. Günter Mair's catalogue no: - SWI-B-1, imperforated, violet-blue/red/white, 
5*****

Year: 1947, Gummed. Günter Mair's catalogue no: - SWI-B-2, perforated V 11 ½ , H strips. It 
looks like it also comes on sheets as my label has horizontal perforation as well. Issued for customers in Egypt, bright red or dark red/white, 5*****

Year: 1949, Gummed. Günter Mair's catalogue no: - SWI-B-3, rouleted H, booklets with 10 
vertical strips of 5, blue/red/white, 3***

Year: 1955, Gummed. Günter Mair's catalogue no: - SWI-B-4, rouleted H, booklets with 10 
vertical strips of 5, orange-brown or brow-carmine/light grey-blue or light blue/white, 3***

Year: 1960, Gummed. Günter Mair's catalogue no: - SWI-B-6, rouleted H, booklets with 10 
vertical strips of 5, black/blue-grey or dark blue-grey/white, spacing modified, 3***