![Amazon.com: WW1 Whistle 1914 J Hudson & Co Trench Army RFC RAF WWI Acme Metropolitan Aged Nickel : Musical Instruments Amazon.com: WW1 Whistle 1914 J Hudson & Co Trench Army RFC RAF WWI Acme Metropolitan Aged Nickel : Musical Instruments](https://m.media-amazon.com/images/I/1135u1kV+7L._AC_UF894,1000_QL80_.jpg)
Amazon.com: WW1 Whistle 1914 J Hudson & Co Trench Army RFC RAF WWI Acme Metropolitan Aged Nickel : Musical Instruments
![1916 "trench" whistle, by Hudson and Co, Birmingham. This would have been used by an officer to signal his troops to go "over the top Stock Photo - Alamy 1916 "trench" whistle, by Hudson and Co, Birmingham. This would have been used by an officer to signal his troops to go "over the top Stock Photo - Alamy](https://c8.alamy.com/comp/DH1NXJ/vintage-first-world-war-1-ww1-great-war-officerstrench-whistle-dated-DH1NXJ.jpg)
1916 "trench" whistle, by Hudson and Co, Birmingham. This would have been used by an officer to signal his troops to go "over the top Stock Photo - Alamy
![Amazon.com: WW1 Whistle 1914 J Hudson & Co Trench Army RFC RAF WWI Acme Metropolitan Aged Nickel : Musical Instruments Amazon.com: WW1 Whistle 1914 J Hudson & Co Trench Army RFC RAF WWI Acme Metropolitan Aged Nickel : Musical Instruments](https://images-na.ssl-images-amazon.com/images/I/1135u1kV+7L._AC_UL600_SR600,600_.jpg)