the materials be mosty lego
I don't think you can make a pocket watch out of Lego--the parts are too small. You can buy a movement and put on a Lego face, as Kiteman suggests. Different types of movements are sold at http://www.esslinger.com/watchmovements.aspx?gclid=CNPo9rWDjJ4CFQRM5QodEjWEqg People have made a lot of larger clocks out of Legos. See http://www.popbubble.com/Lego/LegoClocks/ They are impressive and beautiful.
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Do you mean a pocket-watch with a mechanism built of lego, or a lego case for an existing mechanism, or a lego-themed pocket watch (you can buy lego-themed wrist watches)?
Hmmmm... Nothing found on Google... Something tells me such a thing doesn't exist... YET!