1968 sighting south st louis county , other people witness .5 min new 255 and lemay ferry rd

i was sitting at lemay ferry and an off ramp of the new 255 interchange.the light turned green and the car in front of me did not move .the man was looking to the southwest over a then a central hardware store. other people were looking in the same direction.thats win i notice a round parachutes look thing floating about 1500ft above and behind the store, what seemed odd is it was not falling stayed in one spot also it had dim lighting on the under belly of the object. we watched it for about a min or two long enough to here (do you see that) and other remarks from the crowd of people. then like a flash it took off and up and to the west i noticed something like a vaper trail in the direction it went.we all looked at oneanother and got in our cars want on our ways
Witness indicates that the date of the event is approximate.  PD