Perhaps this is well-known history that I just haven't had the occasion to hear or read, but does anyone know why did Ludwig (WFL) started using the keystone shape for their badges? The discussion in General about the transition from keystone to blue/olive got me thinking. I looked up a timeline on Vintage Drum Guide and it shows a 1937 WFL badge as the first example of the keystone shape. I don't have The Ludwig Book to see what it says, or to check the accuracy of the VDG site. I know the company was based in Chicago, and I have no idea if the keystone has some significance related to that. I live in Pennsylvania (the Keystone State) and am surrounded by the shape here. What do you experts know about this?