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)

The Chinese character "航 空" in bold typeface.

Size: 14mm x 36mm, rouletted, ungummed

Günter Mair Catalogue: CPR-A-?(circa 1980)