July 9, 1948 — Osborn, OH
9:47 p.m. While on the ground in Osborn, Ohio, the USAF Project Sign officer who had flown to investigate the Hecla case, sees a self-luminous, yellow-white object flying at 500–600 mph. It seems to pulse its lights at 3-second intervals as it moves away. [Eberhart]
SIGN Incident 139:
Sources:
Brad Sparks, Blue Books Unknowns Catalogue, Case 99, p.35;
Michael Swords and Robert Powell, UFOs and Government, p. 58;
