Disc shaped saucer craft seen about 100 feet away

I cannot recall the exact month or day but the year was 1979.  I have never made public this information, this is the first time.  I was only 6 years old when I saw this object.  It must have been a weekend at about 5:30 p.m. and I had with two of my older brothers from some activities.  I headed up the third story floor of where we we're staying at the Travelers Motel in Salinas, CA.  I headed out the balcony just to catch some air and I happened to look up.  As I looked up, about no more than 100 feet from me I saw a hovering disc craft that must of been about 30 feet in diameter.  It had some lights at the bottom.  Here is the interesting part: it said something about "FORD" the car dealership sort of like a blimp;  I had just passed by the FORD Dealership about 30 minutes and they were having a sale.  Anyways it was producing a humming sound sort of like a refrigerator.  This object was heading due west and it was traveling at about 20 miles an hour.  The saucer was metallic greyish and i got to observe it for about 1 minute till it dissapeared out in the distance but never the less had maintained its constant speed and direction of travel.  I have not investigated this matter any further but I thinking that I will be checkin the local library regarding any newspaper excepts on microfilm for any reports during that particular year.
Date is approximate.  PD