The following is an Evening Star article from Tuesday, September 2nd 1952 entitled "Tennis Ball 'Saucers' Are Sighted In Japan".
Tennis Ball 'Saucers' Are Sighted In Japan
By the Associated Press
KYOTO, Japan, Sept. 2 - Firemen on lookout duty at four different places in this southern Honshu city reported sightings a "tennis ball" type of flying saucer yesterday, Kyodo News Agency reported.
Kyoto is 326 air miles south of Tokyo.
The firemen said they saw the object "flying southeast at tremendous speed." All four said the object was round "like a tennis ball" and gave off a bluish-white glow. They were certain it was not a shooting star or fireworks.
Source(s): 9/02/52 Evening Star - https://chroniclingamerica.loc.gov/lccn/sn83045462/1952-09-02/ed-1/seq-30/