6:

Air VIA 6,8,12

Bulgaria

 

6:      height VIA 3,3cm,  lenght BULGARIAN AIRWAYS 6,8cm

glossy paper

flat base with coversheet

in the gussets

straight cut

 

8: height VIA 2,7cm,  lenght BULGARIAN AIRWAYS 7,7cm

glossy paper

flat base with coversheet

no manufacturer

identical at both sides

straight cut

 

12: height VIA 3,3cm,  lenght BULGARIAN AIRWAYS 7,7cm

glossy paper

flat base with coversheet

no manufacturer

identical at both sides

straight cut

6:

8: "VIA" smaller, other letters bigger