China
Size: 15mm x 26mm, badly perforated, ungummed
Günter Mair Catalogue: CPR-A-13 (1970)
Size: 12mm x 35mm, perforated, ungummed.
Günter Mair Catalogue: CPR-A-10a (1962-1980)
Günter Mair Catalogue: CPR-A-10a (1962-1980)
The Chinese character "航 空" in bold typeface.
Size: 14mm x 36mm, rouletted, ungummed
Günter Mair Catalogue: CPR-A-?(circa 1980)