I'd like to send this letter to the Prussian consulate in Siam by aeromail. Am I too late for the 4:30 autogyro? | MetaFilter

I'd like to send this letter to the Prussian consulate in Siam by aeromail. Am I too late for the 4:30 autogyro? | MetaFilter: "I lived in England in 1977 and I remember if you didn't get up at the crack of dawn to bring your milk in, the birds would break through the foil top and drink the cream."