The Self Winding Clock Company was a major manufacturer of clocks from 1886 until about 1970. Located at nos. 10 & 12 Dey Street in New York City with a branch office at 39 Madison Avenue in Chicago, Illinois.
They made the four (4) 30' (9.1m)-diameter clock faces on the Metropolitan Life Insurance Company Tower and made products for Western Union and the London Underground. There are two examples at Tooting Bec tube station, that appear to have been recently restored, along with one at Balham tube station.
"The actual clock movements used by the Self-Winding Clock Company were made by other companies such as Howard, Seth Thomas, and H.C. Thompson. They then fitted their winding devices and mounted them in cases of various designs, often made in case styles similar to those of companies like Howard and Seth Thomas."[1]