Another rare orphan display from IEE that sought to offer an affordable (and possible) option for a digital display that looks like it's LED but is in fact incandescent.  A fraction of the power requirements of what an LED equivalent would have been in the mid-70's, but strangely designed to be non-serviceable.  A brief stop-gap measure on the way to cheap high brightness LED displays that came a decade later.  Enjoy!  
Bright 7-Segment incandescent displays - https://www.youtube.com/watch?v=ayJaaJ4QcOQ
Dialight incandescent 7-Segment displays - https://youtu.be/cE66VK_ib4U?t=410
Building my Retro BCD Bench Clock - https://www.youtube.com/watch?v=jwCXhwq6OHU
The IEE "Status Indicator" Display Module - https://www.youtube.com/watch?v=jTnjFOiEPsY
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