H. A.Ward Thunderer whistle, Henry A. Ward was a whistle manufacturer based in Birmingham, active 1889 to 1908.
the whistle is from the early 1890's.
See my article there H. A., Ward History and samples.  
 http://whistlemuseum.com/2009/02/06/h-a-ward-double-pipe---the-city-whistle--c-1890s-birmingham-whistle-museum--all-rights-reserved.aspx 

London type Escargot whistle, Ward is known for two rare Glasgow type escargots:
Alpha Model # 23 and Model # 24, Patent # 2980, both very rare.
Until this one was found it was not known he made any London type escargot whistles. 
One known to exist.

t
The whistle is stamped under the beak
H.A.W.  Bm.



Ward's whistles are all very rare.


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