The Moomnbeam is a flashing light electric alarm clock, first made in Butyrate plastic case from 1948 - 1957; then in rectangular plastic case from 1963 - 1980 or later. Digital versions were made from 1974 - 1980.
When identifying a Moonbeam style, observe the case shape and ignore the case and dial color, because the styles were made in various case and dial colors, as shown in the detail page for each style.
The trademark MOON-BEAM was granted to Western Clock Co. on November 12, 1918, no. 123,511. The registration contains the statement "The trade-mark has been continuously used in our business since April 16, 1918." I am not aware of any Moonbeam clock that early.