I actually had a cheap alarm clock when I was a kid, where this tactic was used. It was one of those cigarette company souvenirs and the instead of the second hand they had the company logo on a plastic disc that would rotate.Many, many years ago, on looking at some watch with complications that were hidden by hands, it triggered something.
I wondered if, instead of hands, they could use a glass disc (or two). With the pointer printed (or stuck) onto it but leaving the central area (other than for the spindle) entirely clear.
Thanks for reminding me of a very old thought.