Whistles were in popular use during the 19th and 20th century for all manner of things. A policeman, fireman, station master etc. would all use one in a professional capacity. They would also be used by a lady on her own, as a security measure, she could blow the whistle in any situation of distress to summon help. At the begging of the 20th century the Boy Scouts and Girl Guides were established, every scout and girl guide would be issued with a whistle.
 
This is the patent thunderer whistle by J Hudson & Co Birmingham.
 
In general good condition.
 
Dimensions: 5cm long