I have a navitimer world which i bought second hand a couple of months ago, but it seems to be losing time, it loses a minute or 2 a day, and every few days i need to reset the time,i wear it all day and...
Without seeing the inside works (movement) of your new (to you) watch and its parts, it's impossible to tell exactly what is going on, but no need to worry, as that's what competent watchmakers are for. Probably just needs a new spring, which wear over time due to many factors, including temperature, shock and corrosion. Basically, when you wind up any mechanical watch (whether automatic or hand-wound, regardless of age), you're tightening the spring which in turn is what powers up the watch (powering up the gears as it returns to its original position--i.e., unwinds, accuracy dependent thus on the spring among other factors). Sounds to me like it just needs a routine service, mechanical watches being no different than are automobiles, which require regular service as well. In the case of a watch, this will entail a cleaning, fresh oil and regulation, with old springs often simply swapped out for a new ones at that time by a watchmaker; routine services are a standard procedure which can be performed by any competent independent watchmaker, and don't cost a lot either. Most watch manufacturers recommend such service be carried out every 5 years or so, and while some can go longer (especially if not worn daily, same as a car when it comes to oil changes/service intervals), it's important to remember to service your mechanical time pieces which, if you do, will provide you with decades of reliable time keeping. All the best.
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