Looks like they had a hard time keeping the guns in inventory marked with their current name as this struggling company moved around and continually reorganized.
The company name was D.M. Lefever & Sons, Syracuse, NY until late 1902, when it became D.M. Lefever, Sons & Co., Syracuse, NY. By October 1904, their ads are D.M. Lefever, Sons & Co., Defiance, Ohio, which continues into June 1905. By July 1905, their ads are D.M. Lefever Arms Co., Defiance, Ohio, and by September 1905, the ads are D.M. Lefever Co. Bowling Green, Ohio. So, the name D.M. Lefever Arms Co. as found on the barrels of this gun was only used in their advertising in July and August 1905. The name D.M. Lefever, Sons & Co. on the sides of the receiver appears on their magazine advertising from December 1902 in Syracuse through June 1905 in Defiance.
