Companion clockswere G.E. and Telechron clocks introduced at the same time, usually with the same features.  For example, the 2H17 Minutemaster and the G.E. 2H18 Chef  both were kitchen timers.  The 7H07 Everset and the G.E. 7H04 Repeaterwere both pioneers for the automatic alarm.   These two above both featured an illuminated dial with a dimmer on the front.  The Illuminette wasn't as popular as it's fraternal twin, Brite Dial and was discontinued after a short time.  By the late 50's, when G.E. was ready to retire the 7H218, Telechron decided to sell it.  It was one of the few times, either company sold both members of a companion set.

2nd generation Brite Dial has a regular, illuminated dial which backlit from the rear of the old dial.   It also features more little dots in the front case.  Why?  Good question...