I was looking up the price of a Sinn 856 on their website and stumbled across this double watch band. It appears to be a separate band for both your Sinn watch, and for your Apple watch that you can buckle together and wear both watches at once. $210. It's functional I guess, but would you wear it?
It wouldn’t work with a dress shirt, too thick. not that many folks are wearing dress shirts anymore these days. Seems clunky, but interesting