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| Issuer | Government of India Mint |
|---|---|
| Year | 2010-2011 |
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| Orientation | Medal alignment ↑↑ |
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| Reverse description | The reverse commemorates the centenary of civil aviation in India, depicting a design celebrating Indian civil aviation history from 1911 to 2011. The commemorative legend 'भारतीय नागर विमानन शताब्दी वर्ष' appears in Devanagari script around or within the field. The years '1911–2011' are incorporated into the design to mark the one-hundred-year anniversary. The mint mark appears in the exergue or field, varying by issuing mint: a small diamond (♦) or the letter 'M' for Mumbai, and a star (*) for Hyderabad. |
| Reverse script | Devanagari/Latin |
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| Additional information |
Issued to mark the centenary of civil aviation in India, this coin commemorates the 1911 Allahabad-Naini airmail flight — the world's first official airmail service, which predated the better-known British and American airmail programs by several years. Henri Pequet flew approximately 6,500 letters across the Yamuna River on February 18th of that year, covering roughly 13 kilometers in a Humber biplane during the United Provinces Exhibition.
The .500 fineness is characteristic of Indian commemorative coinage of this period, a deliberate policy choice that kept silver content costs manageable across a large commemorative program without dropping to base metal entirely.