Note
QST, Jul 1946, p. 99.
QST, Oct 1946, p. 125.
Radio News, Jan 1947, p. 132. ("delivery estimated in May 1947")
Based on available historical records, it's unlikely that the Cardwell 54 receiver, or any other Cardwell-branded receiver, was ever actually sold.
Cardwell, or more specifically the Allen D. Cardwell Manufacturing Corporation, was a major producer of radio parts from the 1920s to the 1950s.
The company was particularly well-known for their high-quality “condensers,” which were used by other radio manufacturers and hobbyists. They also made other components and test sets, especially for the military during World War II.
Advertising for the "Cardwel 54" (actually spelled out—“Fifty-Four”) first appeared in the July 1946 issue of QST, and included an image of the receiver. It’s hard to say whether the image was a photo or an illustration.
Another ad appeared in October, and in the January 1947 issue, an ad included the announcement that the 54 was scheduled for “delivery estimated in May 1947.” That was the last mention of the Cardwell 54.
Cardwell's business model was focused on supplying components, not building and selling finished radios under their own brand. The company appears to have gotten in over their head with the 54, and abandoned the project shortly after the last ad.