I believe its a wind up..not sure if its keywind. Not sure on the age..My mom has it. I will try and get it when I go see her. Give you some more info then. Not even sure what make or model it is.
Even if it is a relatively recent style pocket watch there were oddly designed ones that are relatively expensive to repair. I remember selling Hebdomas pocketwatches when I had a store and today you cannot get parts for them without cannabalizing another pocketwatch.