So I managed to open the case back of the Lucerne - not too difficult actually and what I found was surprising.
And on the dial side, the "complication" revealed. Two revolving discs - one for the hour on the outer ring and the minute in the inner ring. No seconds indication. Just as well - back in the 70s, the pace of life was probably not as fast. So who needs to count to the minute.
Same brush metal for the case and definitely retro. This example tells good time. For more Lucerne Digital watches, please check out my other post Lucerne Digital.