The Original Guide Whistle, the official whistle of the World Girl Guide Movement since 1911 when Elizabeth Branden Powell, founder of the Girl Guide movement , introduced it.
 
6.5cm long, medium tone. Approved in 1909 by Lord Baden Powell and his sister Agnes, founders of the World Scouts and Guides. Unlike conventional whistles, the Scouts and Guides whistles have their own individual sound. They are exclusive to those groups and part of the tradition.