Luke Honey Ltd has dated this piece to the Victorian era.

Width: 40.cm (when open flat)
Dimensions: 20.5cm x 10cm x 6.5cm (when box closed)
Reference: Sir Alan Fersht: "Jaques and British Chess Company Chess Sets”, page 56, figure 102:
“These (Whittington Pattern Sets) are rarely signed, and may have been bought in from other makers. The Whittington has two flaps which contain the pieces, and the Railway a piece of wood to cap the open end of the set when folded over. These date from about 1890 to 1940. Jaques were also cavalier about the use of names and sometimes interchanged them in advertisements...”
Stock Reference: MJ 1943
Luke Honey Ltd has dated this piece to the Victorian era.
You can view the stock and full dealer information on the Luke Honey Ltd Profile Page