Aerial Service completed Sydney
Ordinarily mail from PNG is routed via Australia for further world distribution. Transit point is Sydney. Because of the high cost of airmail, further transmission from Australia was often done with seamail (surface rate). Routing advice by the sender is normal.
Surface rate 3½d, registration 3d, airmail surcharge (PNG to Australia) 3d = 9½d
Correct airmail rate for this letter would be:
1s 6d air mail rate to USA + 3d registration = 1s 9d
On many pieces we find the additional endorsement
Aerial Service completed Sydney
Even though when these and the following impressions are not originating in PNG, they are nevertheless typical for mail coming from Papua New Guinea.
There are further endorsements with similar wording.
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Insufficiently paid air mail was noticed in Sydney, endorsed with a rubber stamp, and forwarded by sea mail (surface rate).
