Escargot – Referee Type, Callander and Oban Railway, brass guards whistle, stamped on the side C&OR
No.3 on other barrel side and stamped on the lip D.Black Maker Glasgow
Round Pea Whistle Type, North Eastern Railway, N.E.R, William Dowler
Two Notes Conical Whistle (TNCW) Type, Bass Ratcliff Gretton-Ltd 137 High St Burton on Trent Staffordshire.
Each one of the 4 types has few sub variations, for example The Escargot referee type can be a Button Whistle using Buttons for sides, It can be a Bakelite or Plastic made, It can be a regular one with an added plate stamped railway name,,
or of construction variation wich can help identify the actual maker.
Here are few from various collections.
To be continued