I recently learned of a mechanical watch that tracks the current week number on one of its outer rings. It's expensive. https://www.patek.com/en/collection/com

I recently learned of a mechanical watch that tracks the current week number on one of its outer rings. It's expensive. https://www.patek.com/en/collection/complications/5212A-001 https://www.patek.com/en/collection/complications/5212A-001