Austria: Airmail labels

Airmail labels from Austria. 3 different versions of the same design.

1. Yellow backing paper, shiny surface, bold font, Dark blue

2. Lighter yellow backing paper, mat, still dark blue but lighter than the first

3. White backing paper, bold font but not as much as the first, mat, more maine blue

All come from a roll and are self-adhesive.

The all look like the design listed in the 'airmail label catalogue by Günter Mair' from 1997. AUT-A-20.