Back in the day you could sign up to be a member of the Goodrich Safety League at a Goodrich Dealers store and get one of these for free.
Here's a link to a Goodrich ad from Life magazine Sept 27, 1937.
http://books.google.com/books?id=MUgEAAAAMBAJ&lpg=PA120&ots=9tGh2eBQOR&dq=goodrich%20silvertown%20safety%20league%20%3F&pg=PA120#v=onepage&q=goodrich%20silvertown%20safety%20league%20?&f=false