You are bidding on an original Photofact service folder.  This manual fits the following model (s):

1950 DUMONT RA-105B, RA-108A

This manual contains such material as alignment instructions, schematic drawings, exploded views of the interior, parts listings and more.  This item is used, so consider it best for information to restore your vintage electronics item as opposed to a collectible. 

This manual is 24 pages long.