According to the trade catalog posted to this site, John Becker manufactured the machine in his "shops in Boston", but the sale was handled through Pope Manufacturing Company. The original 1886 patent is assigned to the World Type Writer Company, and the first newspaper advertisement I could find that was not put out by an "agent" was on December 7, 1887, and was published by the World Type-Writer Agency, "headquarters for Connecticut, Maine, New Hampshire and Vermont". Some of the agents that sold the machine as listed in ads earlier that same year included Dayton & Hall in Portland, OR, Geo. A. Wright from Concordia, KS, D. Bugbee & Co., and The Novelty & Electric Company in Memphis, TN. By 1893, an advertisement in The New Nation magazine stated that the Typewriter Improvement Co. was the "Sole Manufacturers of the WORLD Typewriter and the WORLD Duplicator". Advertisements for the World seem to run through 1895.