This model dates from the early 20th century. The production started in Cincinatti in 1899 and the production of this "Standard Style" model was discontinued in 1922.
"Pattern D-8 1/2": refers to the "depth-inside height" of this upper section (smallest):
D =11 1/2 inch (29.21 cm) outside en 9 1/2 inch (24,13 cm) inside;
8 1/2 inch (21.59 cm) = inside height.
"Grade 398" refers to the finish: imitation medium dark mahogany, maple/red birch, highly polished.
The top and base have each a distinctive rounded look (commonly referred to as "waterfall").
This base is made with a drawer.
The complete bookcase consists of 5 modules, a top and base (drawer).
Making the final dimensions: 212.5 cm high, 87 cm wide and 44.5 cm deep.