Here is very nice airmail label from UK issued by Lundy private local post. Label is same as GBR-A-24b
with embossing of two birds (Puffins).
Year: approx.1960, Gummed. Günter Mair's catalogue no: - GBR-C-19, perforated H 13, V 14,
Sheets of 36(3x12), "BY AIR MAIL" : 28mm, "PAR AVION" : 18mm, black/blue/white, 5*****