Sleep Meter style 1 is a nickel bell back alarm, introduced in 1914. Style 2 is a thinner inside-bell alarm with top shutoff button. An electric Sleepmeter was made from 1954 - 1957.
The trademark SLEEPMETER was issued to The Western Clock Mfg. Co. on December 27, 1910. The registration contains the statement "The trade-mark has been continuously used in our business since August 1st, 1910."
A cast zinc cased Sleepmeter was made in Canada.