In the November 1924 The Radio Trade Directory under the heading manufacturers of Vacuum Tube Sets on page 80, the Chas Freshman Company was located at 106 Seventh Avenue in New York City.
Also, Chas. Freshman Co. Inc.; Freshman Building, 240-248 West 40th Street, New York.
Also, S. Freshman Co.; 225 N. Michigan Ave., Chicago. S. Freshman was said to be Charles' brother, Sigmund. 

Around 1925/26 Freshman introduced, under the name Polydyne but with the same factory address, a set exactly like the previous season's model, to be sold by department stores, undercutting his own dealers, who were understandably furious. (Quotation from A. Douglas, Radio Manufacturers of the 1920's).

Freshman Masterpiece radios were exported to the eastern states of Australia from 1926 to 1928. 

The company branded a half wave rectifier tube in the late 1920's. This tube possibly was made for them by Ken-Rad and the type number is not known. 

Chas. Freshman Co. Inc.; New York: After being bought out by Walter B. Chrysler in Dec. 1927, Clarence A. Earl was installed as president.  In November 1928 it merged with Freed Eisemann and the name was changed to Earl Radio Corporation.  The company had 2000 employees and sales of $1 million in June 1929 from 13,975 sets produced.  In July, 23,546 sets were produced, but the stock market crashed and Earl went into receivership on Nov. 22, 1929.