1. An hour hand that isn't moving, even though the minute hand advances normally (i.e., either when the watch moves or when you're moving the crown to set the time) can be caused by both minor or major problems. One potential cause is that the hour hand may have come loose from its barrel pinion; the pinion is moving, but the hour hand isn't advancing with it. When this happens, you can usually flop around the hour hand by shaking the watch. If this turns out to be the problem, it's an easy and inexpensive repair: the watch movement is taken out of the watch, and a special tool is used to reset the hand. It usually takes longer to get the movement out of the case than it does to reset the hand.
A more complicated cause for this problem might be that the the gear driving the hour hand has become dislodged. This is not as odd-sounding as it sounds; the gears that drive the hour and minute hands sit on top of the watch movement, just under the watch dial. Pressure from the dial keeps the gears in place; otherwise, they simply lift off. Fixing this problem would entail taking the movement out of the watch case, carefully removing the hands and then removing the dial to get at these gears. Again, this is not a complicated repair, though it's more time consuming than simply re-setting the hour hand on its pinion.
Finally, a third cause for this problem is that dirt has jammed the hour hand gear or that the gear has broken in some way (lost one or more teeth, cracked, etc.). That kind of a problem usually makes it noticeably difficult to advance the minute hand, though, which isn't something you described.
2. This watch has a screwback case back; you'll need a "watch crab" or "case wrench" to unscrew the back. High-end versions of these tools can be quite expensive, but inexpensive models suitable for casual use can be found at Harbor Freight, American Science & Surplus, and any number of other online retailers. The actual watch battery should only set you back $2-4. However, if you want to maintain the "very" water resistant feature of this watch, you should also replace the little neoprene gasket between the case and case back every time you open the watch. These gaskets are extremely cheap, but they're usually only available in batches of 50 or 100 from a jewelry supply house. Even then, it can be as little as $5 for a lifetime supply of gaskets for several watches.
3. Is it worth it to fix this watch? That's a deeply subjective question. If you really like this watch, it may make sense for you to have the watch repaired. Certainly, a simple battery change is more than reasonable in terms of maintenance. However, in terms of repairs to the hour hand, repair costs may be more than the replacement cost of the watch. I saw one online site selling this watch in new condition for $65. Re-setting the hand without removing the dial would probably cost at least $20; I don't know what a watchmaker might charge to dig into your watch a little deeper if the problem is more complicated than that. A friend of mine recently paid $30 to have her watch battery changed at a jewelry store (she got ripped off).
Well, thats a good watch. however, based on the conditions of your watch, probably, its battery is not dead. some of its mechanism were not in place or broken. Repairing it is advisable. Afterall it has no scratches like what you've said. So go for repair men!
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