This set was purchased, by another collector, in England, from the
widow of one of Baird's assistants. It was in her attic, and
was one of the first sets Baird allowed to leave the laboratory on a
permanent basis. Some British expert (allegedly) dated it as no
later than 1928. It has more controls than other scanning disc
sets. It is complete, and the plug is the type used to plug
into British light sockets, as opposed to electrical outlets.
Courtesy of Fred London