Hello. Please bear with me, I'm a newbie when it comes to watches and the lingo. 1) I would appreciate help with identifying my watch model and any other info. I think it looks like the 1500 model but it has a 24 hour dial and is marked "GMT professional 200 meters". Is this a 1500 model or another model named GMT? The back of the watch says "159.306/1". I would like some links to info on the watch if anyone knows any. I looked in some of the Tag Heuer catalouges on this website but couldn't find it listed. Is this a rare model or what's up? Can't find much info if I search the net on "159.306/1" either, but my google-fu might be weak. It's from the mid 90's. 2) What is a watch like this worth today? 3) The watch hasn't been worn for years, and is not running. I hope it just needs a battery change. Reading up a little on watches, some websites says watches like this needs service with cleaning and oil change/refill every X years. Is this needed you think or only a battery change? 4) I'm considering changing the strap for a NATO strap, they look comfortable. I guess there are things to consider (like always) when buying a NATO strap too. Trying to measure the lug width it seems to be ca 22 mm. Anything special I should think about when buying a NATO strap for this watch? 5) Lastly, honestly I'm poor, so unless this watch is worth a shitload of money (and I doubt it is but hey who knows), I would like to change the battery and strap myself. Can someone give me links to guides on doing this? Thanks a bunch!