I'm not sure what the technology this clock uses is called, I suspect it is a edge-lit lightguide display. There is a light bulb in the back and it shines through a mechanically powered matrix of some sort.

"Midland International" clock, unknown display technology uses mix of mechanical and digital components, incandescent backlit display, bought in 2004. 17 x 9 x 19.5 cm, 1112g.

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