Bell (Charles Williams) coffin subscriber set

Bell Telephone Co subscriber set, consisting of manual switch "coffin" style magneto ringer box. Ca 1877-1878; wall magnetic transmitter, Ca. 1877-1878, and wooden hand telephone receiver, Ca. late 1870s through 1880s. Ringer box and transmitter manufactured by Charles Williams, Jr., Boston, Massachusetts. Ringer box marked on front lighting arrestor "Made for / Bell Telephone Co." and "Manuf'd by / Charles Williams Jr. / Boston"