This modular bookcase was made by the Globe-Wernicke Company, which was formed as a result of the Cincinnati based Globe Files Company (est. in 1882) purchasing the Minneapolis based Wernicke Company in 1899. The company is best known for their high end bookcases, Desks, and other office furniture. Globe Wernicke established factories in the United States, United Kingdom, France and Germany.
The company patented the 'elastic bookcases' also known as a modular bookcase. These were a high quality stacking book shelves, with a standard width of 34 inches, in Oak, Walnut and Mahogany, capable of being adapted to fit together to form a bookcase which could either be all of the same measurements or which could be re-arranged by the insertion of units of different depths and heights.
These glass fronted shelves now are proving to be collectable, desirable and usable antiques, quite often these bookcases appear in auctions and internet sites and, what originally cost $75 or so will now sell for $900 or more.