
This is India 1954 1½A Ashok Stambha gray green on yellowish paper
inland letter card (Higgins and Gage FG17) (18.7cm×24.7cm) with narrow outer flap, printed by India Security Press, Nashik Road.
It is different from India 1950 1½A Ashok Stambha gray green inland letter card (H&G FG6), the first Indian ILC issued on October 2,1950, having same imprint and size that of H&G FG17 but with wider 6mm double flaps with small inscriptions in Hindi and arrows indicating the folding lines.
Edward G Fladung erroneously included these ILCs alongwith H&G FG7 under Airmail section in H&G listing, as these were strictly not aerogrammes.
These ILCs were issued for sending to/from remote regions in India at reduced postage than letters, to be dispatched by inland airmail at the nearest air terminal, following the
All-Up Airmail Service introduced on June 30,1949 by Indian Posts and Telegraphs Department, under which all 1st Class mail including ILCs had to be transported by air wherever possible.
ILCs were added to the list of articles which were not subjected to air surcharge which was first removed for the letters and postal cards under Section 154A(2) following the Postal Notice No.75 dt. April 1,1949.
The 1½A inland letter card postage was in effect from October 2,1950 to March 31,1957.
Details can be found in,
1. India Post thru Ages A Saga of Communications.
H Nur Ahmad.
Postal History Society, India, Aluru 1996
Chapter III: Structural Growth of India Post; p.88
Chapter IV: Functional Growth of India Post; pp.98-9
2. India Post A Journey thru Ages.
Arvindkumar Singh.
National Book Trust, India, New Dilli 2009
Chapter XVI: Airmail Service; pp.175-7
The Devnagari inscriptions in Hindi at the upper left corner of the ILC here read
#2309;#2344;#2381;#2340;#2352;#2381;#2342;#2375;#2358;#2368;#2351; #2346;#2340;#2381;#2352; (Antardeshiya Patra) i.e. Inland Letter and
#2311;#2360; #2346;#2340;#2381;#2352; #2325;#2375; #2309;#2344;#2381;#2342;#2352; #2325;#2369;#2331; #2344; #2352;#2326;#2367;#2351;#2375; (Is Patra ke Andar Kuchh Na Rakhiye) i.e. Do not put any enclosure inside this letter.
Here the inland letter card was used as an aerogramme, uprated by affixing India 1955 6P SG 355/Sc 255, India 1955 4A SG 360/Sc 260 and India 1955 6A SG 361/Sc 261 to make it 12A which was the air letter postage from India to Canada from March 24,1953 to March 31,1957.
Incidentally, India–Canada Air Letter Service began in September 1946.
However, I could not find the exact location of the Experimental PO
A-278? in July 1956 but it was at a place where certainly there was no supply of aerogrammes for international mail, specifically the 1954 12A H&G FG16.