Good luxury watches are usually mechanical, cost a small fortune and make for fantastic heirlooms. Smartwatches tend to
be digital and cost much less than a smartphone, but you need to replace it every two years.
Now, smartwatch functionality such as activity tracking and sleep monitoring are being built into the watch strap, so you can add such smarts to any traditional mechanical watch.
The very finest example thus far is the E-Strap by Frederique Constant, constructed of materials befitting your heirloom piece, but with some smart microchips subtly built in.