Princess Elettra Marconi Giovanelli unveiled this plaque on the 231st May 2007 in the presence of her son Guglielmo to commemorate the 100th anniversary of the wireless station at Derrygimla owned by her father Guglielmo Marconi

Derrygimla, Maum
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Colour: grey

Wikimedia:

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See also...
Photo of Guglielmo Marconi marble plaque
Eugene O'Loughlin on Flickr PD 1.0
Photo of Guglielmo Marconi gold plaque
Simply Jan on Flickr
Photo of Guglielmo Marconi gold plaque
Simply Jan on Flickr
Photo of Guglielmo Marconi, Wireless Telegraph Company Limited, and Nellie Melba bronze plaque
nick.harrisonfli on Flickr
Photo of Guglielmo Marconi blue plaque
Spudgun67 on Wikimedia Commons
Photo of Guglielmo Marconi grey plaque
Spudgun67 on Wikimedia Commons
Photo of Guglielmo Marconi blue plaque
Pete Reed on Flickr
Photo of Guglielmo Marconi blue plaque
rw_norris2000 on Flickr
Photo of Guglielmo Marconi and Nellie Melba blue plaque
cazphoto.co.uk on Flickr
Photo of Guglielmo Marconi brass plaque
blech​ on Flickr
Photo of George Kemp and Guglielmo Marconi blue plaque
Kay Atherton on Geograph
Photo of Wireless Telegraph Company Limited and Guglielmo Marconi blue plaque
Stuart Axe on Flickr
Photo of Madeira Hotel, Court Royal, and Guglielmo Marconi blue plaque
Alwyn Ladell on Flickr