Hello, A very nice cover. A little bit of history about Mawson station. http://www.antarctica.gov.au/about-antarctica/history/stations/mawson James
My cover of the day is this Well Fargo cover from a Siegel Auction http://siegelauctions.com/enc/pdf/Pony_Stamps.pdf
Hello H, nice cover. I can read July 3rd, my granddaughters birthday. Any idea of the year? The pony express stamp is an imperf but I can't read the value. The ten cent green I cannot date. Maybe where the range of dates for the two stamps cross would narrow the date? James.
The pony express only operated 19 months from April 1860 to October 1861. The pony express stamps were not printed until April 1861 so that definitely dates the cover to July 3, 1861.
Thank you for the additional information, stored for later use I did'nt realise that the PDF file contained additional information, now saved to HDD. thank you, James