The substrate of this card is translucent light-green with brass-colored printing on the obverse side and silver-colored solder lines overlayed by a translucent bright-green square on the reverse side . The obverse is covered with burnt-orange, yellow, silver, and light-blue components; the three identical silver-colored, circular Texas Instruments components are marked "CT 306 914"on the top. The obverse substrate is marked " b/A" on the right side, and "NO.116029, 128050b/A, ET AMPLIFIE, and BT11" along the bottom. The reverse substrate is marked with a black stamp "1564" in the bottom-left corner.