That TV is a great find. The "new" Garod Tele-Zoom feature is mentioned here about 1/4 of the way down the page.
http://antiqueradios.com/features/1949tv.html
I found it interesting that Garod, and others, manufactured some models for RCA. When going through the RCA archives at the Hagley Museum I saw this in an RCA internal document, dated 6/21/45, specifying the serial number format and labeling to be used on RCA products.