I noticed in Ken's post about Aero's current sale that he also has reproduction "WW2 Style RAF "Acme" Thunderer Escape Whistles". That reminded me of flight jacket related topic that I have long been curious about...telling the differences between original WW2 RAF Escape Whistles and the reproductions. Below is a whistle I have had for a long time, and always assumed to be real. However, I don't really know much about these, and hope some of you with more experience can point out the differences...including if there are clues related to the numbering. One thing I noticed in taking the photos that was not as obvious before, was how sharp the stampings are...always interesting what you learn with a photo sometimes...though it can cut both ways. Thanks for the help and input!