.
"BY AIR MAIL", in serif typeface, 17mm.
Size: 18mm x 38mm, perforated, gummed.
Günter Mair catalogue: TAN-B-3
(1980)
Printed on thicker paper
Size: 19mm x 37mm, rouletted, gummed.
Günter Mair catalogue: TAN-B-4
(1978)
.