Australia: Aerogramme Uprated because of Enclosure

This is Australia #A-6, sent from Claremont (5 FE 54) to Baltimore, US. Correctly uprated to the 2 s air mail letter rate to the US, because the aerogramme contained an enclosure.

The sender even endorsed this on the sealing flap: "(Extra postage added)".

The aerogramme shows a 5 mm pip at the bottom of the writing panel, 45 mm to the left of the overlay.