William Dowler & Sons made whistles between the 1880s and 1904 but after 1904 they contracted manufacture to J. Hudson so their brand name continued for a while. This can help when it comes to identifying their whistles.
- Whistle marked “Great Charles St” : 1880s-1901
- Whistle marked “Graham Street Works”:
- a tongue present in the mouth piece : 1901-1904
- no tongue in the mouthpiece : 1904 onwards (manufactured by Hudson) [some whistles at this time were made by De Courcy but I haven’t seen any of these to know how to split them]