https://books.google.com/books?id=ce...%20bat&f=false
A part of a book that has a paragraph on the Lajoie type of bat. It was used to help choke hitters have more control. Never really caught on. The time period of the articles mentioned is the first few years of the 1900's. I have not seen another with the double ring like this. Also, the ones I have seen are made by Wright and Ditson and have Lajoie's name engraved on them. Perhaps this is a knock off?
Super cool item that reminds me I need to go to more flea markets! Congrats on the find.
Tom C