The complete set in detail

SA05
Sc Nr. C5
1934 - Air : Propagand issues for the plebiscite, overprinted 'Volksabstimmung 1935' - 50 Cts. ; brown-red

SA06
Sc Nr. C6
1934 - Air : Propagand issues for the plebiscite, overprinted 'Volksabstimmung 1935' - 60 Cts. ; orange-vermilion

SA07
Sc Nr. C7
1934 - Air : Propagand issues for the plebiscite, overprinted 'Volksabstimmung 1935' - 1 Fr. ; violet

SA08
Sc Nr. C8
1934 - Air : Propagand issues for the plebiscite, overprinted 'Volksabstimmung 1935' - 5 Fr. ; brown