This is my latest acquisition--a beige and brown Tower Challenger typewriter, from Bremerton Office Machines. It has been completely refurbished, and works like a breeze. The platen rubber is still soft--when I type on paper, it shows up on the roller. At some point, the carriage-return lever was replaced with one from a Royalite.
Notice the Sears logo next to the word "Tower." Tower was a brand name used by Sears, and was being phased out when this typewriter was made.