Here is the first airmail label from St. Lucia.
Saint Lucia is a sovereign island country in the eastern Caribbean Sea on the boundary with the Atlantic Ocean. Part of the Lesser Antilles, it is located north/northeast of the island of Saint Vincent, northwest of Barbados and south of Martinique.(wikipedia)
Year: 1931, Gummed. Günter Mair's catalogue no: - SLC-A-1a, perforated H 12, V strips of 2,
watermark: ¦¦¦¦ or ≡ , black/light violet-grey, 4****
Year: 1932, Gummed. Günter Mair's catalogue no: - SLC-A-1c, rouletted H 12, V strips of 2, black/light blue, 4****