 Between 1903 and 1933 Sessions produced 52 models of mechanical clocks, ranging from Advertisers, large and small clocks with logos of various businesses, to wall, or regulator clocks, and shelf or mantel clocks, designed for the home.Many of the Session clocks from this period are prized by collectors.In 1930, the company expanded to produce electric clocks and timers for radios, while continuing to produce traditional brass mechanical movements.