The earliest and most valuable wood phones were made by Charles Williams, Jr. of Boston. Williams had been an early telegraph manufacturer, and also made hardware for ;
Edison and Bell. Coffin phones from the late 1870s produced by Williams for Bell were frequently made of mahogany and sometimes featured Blake transmitters and Roosevelt automatic switch hooks. Typically tall and bulky, they needed several compartments to hold the batteries, and the magneto, a hand cranked generator used to signal an operator, who then actually placed the call.
Indulge in the The Coffin Phone, 1870s Vintage designer mobile cover and case for Vivo V5 & V5S.