This vintage desk accessory is a Nichols brass perpetual calendar with a pen holder, dating back to the 1940s. The calendar is set on a marble base and was manufactured in the United States. It is a collectible item and can be used as a paperweight or desk decoration.  The dials are a little hard to turn but still works.  App 7" long, app 3" wide and a depth of app 1" . Please see photos. 

(B)