Here’s a great bit of cycling ephemera from David Evans. Lord knows where he found it, but I so love this. A brief history of Villiers, a true Wolverhampton engineering success story, who were associated with Sunbeam bicycles can be found here on the Wolverhampton University local history pages. I think this pamphlet is from the 1930’s.
While we’re on the subject, some very exotic systems appeared in the years before the derailleur and hub gear became the accepted norms. Hirondelle and others used a system that gave four gears in a very peculiar, innovative way. The system below is French and dates from 1925. See if you can work out how it functions.