Project Blue Book Case #1554. On July 23, 1952, a bright object was observed over Pottstown, Pennsylvania — the second Blue Book unknown from this suburban Philadelphia community (following Case #1351 from June 26). July 23 was during the absolute peak week of the 1952 wave.
Pottstown's production of two unknowns in less than a month paralleled patterns seen at Lake Charles, McChord, and other repeat-sighting locations. The case was classified "Unknown."