RCA black/white <a href="https://en.wikipedia.org/wiki/Indian_Head_test_card" class="extiw" title="en:Indian Head test card"><i>Indian Head</i></a> test card, motif of the <i>2F21</i> <a href="https://en.wikipedia.org/wiki/Monoscope" class="extiw" title="en:Monoscope">monoscope tube</a>, used from 1940 until the advent of color television.
RCA
<a rel="nofollow" class="external free" href="http://www.high-techproductions.com/testpatterns.htm">http://www.high-techproductions.com/testpatterns.htm</a>