Here courtesy Tom Genova's "TV History" site is an late '54 or early 1955 Raytheon sales brochure. The 19" color set is pictured in the lower right. The text is small and doesn't mention sq.inches. The set pictured has the internal mask pix.tube. Raytheon produced a 21" model later in 1955.
1955-Raytheon-Brochure.JPG
http://www.tvhistory.tv/1955-Raytheon-Brochure.JPG
-Steve D.