[Celt]

"Digital" clocks go back as far as the early '20s. Seth Thomas made one model movement for decades that simply worked like an odometer on your car. As the second block rounded to 60, it would in turn advance the minute blocks and the minute blocks would in advance the hour blocks. The blocks were usually white or brown phenolic. General Electric/Telechron also had an early mechanical/digital system that used white numbers printed on black leafs. Same scenario as above. The Telechron movements almost always had a neon light for illumination and rather than displaying seconds, they had a bizzare striped wheel that spun on the far right hand side. These usually had a timer or alarm function on them as well. These were commonly used in clock radios by many different brands.