The round tube Westinghouse color set pictured has an almost identical control knob configuration to the 22" rectangular color set. The two large knobs on either end and three smaller center knobs placed horizontally above the screen. Even the trim design is similar. The letter/number on the brochure (RM4226) could designate RM-rectangular-model-(4?)-22-color tube-(6?). The 22 might also represent screen size. the rectangular pictures in the brochure may be generic since they seem to be discribing contrast/brightness and not color controls. And may also have been used in black-white owner manuals. Just my speculation.
