This is a rare calculator pencil made by Ruxton Multi-Vider of New York in 1929 in box with 11 page directions.  It is made of Bakelite with 14-karat Gold filled trim.  This is the Executive model.  The box advertises instrument multiplies and divides.  By sliding side of pencil to desired calculation, answer is given.  Removing top reveals a worn eraser.  Pencil has a black colored lead.  Included is original box and seldom found 11 page directions.  Directions are fragile and each page placed into a clear divider to protect.    This 81+ year old instrument is in good operational condition.  Collectors of engineering calculating and computing history memorabilia will find this a highlight.