lower left in black ink: 120/sec.; lower right in black ink: Harold Edgerton; center verso stamped in blue ink: H.E. EDGERTON / M.I.T. 4-405 / CAMBRIDGE-MASS.; lower right verso: Edgerton Estate stamp; all by later hands, in graphite: upper left verso: 10.643; lower right verso: 10.643
The Harold and Esther Edgerton Family Foundation; gift to NGA, 1996.