The bird certainly has more of a 20's/30's appearance then 40's. I've only come across one other example of this clip in over 20 years of collecting, and its resting comfortably in a private collection. These benefits took place annually at Sportsman's Park to help eradicate the disease starting in 1915 and ending in 1942.
The item "RARE MINT ST LOUIS CARDINALS PENCIL CLIP PINBACK PIN BUTTON VINTAGE world series" is in sale since Friday, July 13, 2018. This item is in the category "Sports Mem, Cards & Fan Shop\Vintage Sports Memorabilia\Pins". The seller is "mode101depeche" and is located in Highland, Illinois. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica. Louis Cardinals