How big is the Big Bold Open Hearts on the wrist?

The Big Bold line uses a 47 mm case, which is large for a Swatch. It reads as an oversized statement piece, so it suits wrists that can carry that width.

What makes the Open Hearts dial different?

The dial has a cut-out heart design that exposes the movement instead of a solid face. That open-heart look is the main visual feature of this model.

Is it a mechanical or quartz watch?

It is a quartz watch, so it runs on a battery and needs no winding. That keeps it low-maintenance compared with automatic watches.

Swatch Big Bold models are generally rated for everyday water contact such as hand washing, not swimming or diving. Check the caseback rating before getting it wet.