ESSA 3 and ESSA 4, satellites of the TIROS Operational System.
NOAA
circa 1966 <div style="display: none;">date QS:P,+1966-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external free" href="https://www.photolib.noaa.gov/Collections/NOAA-In-Space/Space-Vehicles/TIROS/emodule/702/eitem/23135">https://www.photolib.noaa.gov/Collections/NOAA-In-Space/Space-Vehicles/TIROS/emodule/702/eitem/23135</a>