Silent Disc/Saucer w/lights moved eastward over C&O Canal at tree top level.

Our family had recently moved into a newly built home, one evening in the living room I was watching TV (So was younger sister), my mother was there talking on phone, my father was outside standing on our open side-porch (Facing west), he comes running in shouting to my mother "Come here, look at this!"  
All of us run outside to front lawn, looking to area in our large backyard and toward the Chesapeake & Ohio Canal (MP-167), I watch as a disc with lights is traveling east just above the canal at tree top level, and about 400-425' away from us at approximatley 30 mph.  Even though it is nighttime I can clearly see it's shape and the lights around it, it is of medium size, and is making absolutley no sound.  People who know me are amazed at my sharp memory for recalling events and dates from many years ago, this either happened in the fall of '67 or '68, one of the two.  This sighting was not an airplane, a toy, etc.  I still remember well to this day close to 40 years later.
Therefore I know that I have seen a valid UFO.
Source of report indicates that date of the event is approximate.  PD