I'm more commenting on how watches have remained the same size for a long time. I'm not even talking about smart watches. I want something that tells me the t

I'm more commenting on how watches have remained the same size for a long time. I'm not even talking about smart watches. I want something that tells me the time that is one step above the lower limit on possible watch sizes. It doesn't have to be an analog or digital display, it doesn't even have to have hands! Just a series of LEDs would be fine.