The Old Letters Project is an artificial collection of about 100 pieces of correspondence held in the Windsor Historical Society collections. Although the source and provenance of these letters has not been determined, the documents apparently came to the Society from a variety of sources. The collection is predominately personal correspondence; perhaps one fifth pertains to business or legal matters. The letters were written between 1794 and 1907 with the bulk of the collection dated between 1820 and 1840.
Approximately half of the collection is comprised of letters between members of the Ellsworth family of Windsor, Connecticut. Another one fifth of the collection is associated with the Hayden family of Windsor. Other family surnames in the collection are Allen, Clapp, Clark, Ellsworth, Filer, Fyler, Gaylord, Gibbs, Gillespie, Griswold, Halsey, Harris, Hayden, Hoadley, Howard, Kellogg, Loomis, Lyman, Mather, Morrison, Niles, Perkins, Phyler, Remington, and Stiles.