A power supply for a Telstar (Pong) dedicated gaming console, made by Coleco and released in the late 1970s.  Telstar and similar Pong consoles usually ran off battery power, but had the option for AC power through a separately-bought power supply.  Output is 9V DC at 200 mA.
<a href="//commons.wikimedia.org/wiki/User:Evan-Amos" title="User:Evan-Amos">Evan-Amos</a>
<span class="int-own-work" lang="en">Own work</span>