It fits perfectly on the recent facsimile of the book offered by the Bradford Exchange; it could also be used on an original George M. Hill first edition. It even works on the earlier facsimile produced by Books of Wonder - although it was just a bit wide for my copy. It's a fun touch to complete the appearance of the book!
Don't forget, the Kickstarter campaign for this year's production of The Tik-Tok Man of Oz is still running - any contribution will help to make this an even more memorable occasion. Here is a video plug for the show!