Up for sale soon at Corinphila (https://stampauctionnetwork.com/CO/CO19553.cfm
Australia 1919Â (Oct 1): Ross Smith Flight, England to Australia. Special Blue stamp (some irregular perfs at left), tied by one of two crisp strikes of "First Aerial Mail, Great Britain to Australia, Received, 26 Feb. 1920" on cover from Baghdad to Sydney, with autograph "Bennett 12. 12. 19" on reverse. The cover has its original content and is heavily damaged but skillful supported. In spite of its faults a very desirable cover.
What would be a reasonable price for this? Opening is 1500 Swiss Francs.
As nobody else has, I will stick my neck out and say that in view of the relative scarcity of these covers, even in this condition I would guess it will achieve well in excess of treble the starting price.
There are a couple of features with this cover, apart from the scarce Ross Smith vignette which appears to obtain in excess of $2000-2500 on cover, or even on piece.
Baghdad only came under British occupation in 1917, I have a couple of covers from this era and they always obtain a large premium over similar from other areas. I doubt very much there are more than a handful of covers from Baghdad with the Ross Smith.
The writer would have been stationed in Baghdad and the initial mail sent On Active Service, it would then have passed to an intermediate, where it would have made its way to Ross Smith on his flight from England to Australia.
The cover has a note saying dated Baghdad 10/1/18, this was very early in the conflict and British forces had only taken control of Western Persia some 2 days earlier! The Autograph Bennett on the reverse may relate to the intermediary or the correspondent. The cover took over 2 years to be delivered 26th Feb 1920 so hopefully it wasn't important
There was a Private Harold William BENNETT, 11947, 2nd Battalion, Queens Own Royal West Kent Regiment wounded in Baghdad at this time.
Hopefully others may also voice their opinion.