Stratton Bros .
Edwin A and Charles M. Stratton began making rifles for Springfield Armory before founding a level business in 1869. Edwin sold the business to his son-in-law, Raymond O. Stetson in 1902, who may have continued to use the name up to 1908.
STRATTON BROTHERS/GREENFIELD/MAS (sometimes curved, sometimes with combined city and state line, sometimes with an eagle)
This company was later acquired by Goodell-Pratt. This company used Millers Falls for their sales agent initially.
Nelson, Robert E., Ed. (1999). Directory of American Toolmakers: A listing of identified makers of tools who worked in Canada and the United States before 1900. Early American Industries Association.
/PDFsforInventory/WebVaIRmachinists_PDF.pdf - Page 6 has a listing of a Stratton level in the collection.