Incredible and rare piece!  This item appears to me to be complete, but In comparing the unit to a rather crude depiction on the box exterior.  19 pictures are included with this listing, so please view them for yourself to determine.  The condition is quite remarkable, with the chrome finish switchboard having very few marks at all, the plastic phone units vibrant and apparantly flawless, all of the yarn lines complete.  As far as testing, I did not "play" with this vintage toy, but made sure all of the plugs on the switchboard could be removed and reset, and thx was successful.  I know it rings, because the entire ride home any bump in the road caused it to do so.  Original box is complete but has age-related wear.  This is an awesome, old toy.  Please see pics for further description and condition.