If you want to use a watch as a hammer then an el cheapo Invicta Seaspider 0138 might be a better bet.
http://www.amazon.com/Invicta-0138-Collection-Stainless-Polyurethane/dp/B003UNZ07WThe Seaspider keeps reasonable time as well. My one has gained about 24 seconds in the last 6 months. Well within the Swiss made quartz movement
specs. Probably not suited for Ectomorphs though!