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This is Montevideo Airport in Uruguay - MVD.
Agreed, ICAO code is SUMU by the way.
Incidentally, Montevideo/Carrasco is one of a handful of places where you can still see an intact, albeit neglected, Viscount.
Plug -34.84426 -56.02775 into Google Maps or Google Earth.
The Viscount´s CG shows up at 34°50´39.29" and 56°01´39.87" at Google Earth. Also some Dakotas (but they are not that uncommon) and a Friendship outside the perimeter.