Silent Cylinder Hovers over Schoolyard in Central NJ

This sighting occured on the first day of fifth grade in September of 1965. The schoolyard was full of kids playing and awaiting entry into the school. I glanced up and saw an object hovering silently with no markings or lights, about 100' up. It wasn't darkly colored nor was it shiny, but it was clearly a cylinder. It was oriented as if one had taken a can of vegtables and lifted it off the table and into the air. I looked down to tell a friend to look up and when I looked back up it was gone. I would say the object was 12 feet tall and the diameter on the bottom about 4 feet.
Witness indicates that date is approximate.  September 05, 1965, fell on a Sunday, so we suspect that the date is flawed.  A better date might be the first or second day after Labor Day, which would have been September 07, or 08.  Note proximity of date to date of the Incident at Exeter.  PD