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A. Lange & Söhne

My thoughts

 

As others have said, providing a picture and indicating the position of the loose screws would be helpful.  Loose screws don't necessarily indicate the watch is fake, so I wouldn't worry about that.  The main concern with loose screws is that they can move around, damaging other components.  Even if they're not leaving the screw holes completely, I would not wear the watch until they've been tightened down.  Since there are 2 screws loose, it's hard to say if other screws are also close to coming loose. 

Loose screws are very common repair issue for watches.  A single loose screw can stop the balance wheel or automatic rotor, or can scrape/scratch the movement enough that debris then causes the watch to stop.  If you have a loupe handy, you can see if there are any signs of scratches or metal particles on the movement.  At the factory level, screws are tightened to a certain torque - it's really a fine balance because too much torque and the screwdriver will mar the finish of the blued screws, too little and the screw will come loose rather easily.

The standard procedure would be to bring the watch to the AD and they will most likely have to send to the ALS service center for a repair quote.  I would expect ALS would want to perform a complete service on the watch, especially if it hasn't gone in for service recently.  Alternatively, you can bring to an independent watchmaker for evaluation (definitely someone with experience on fine timepieces).  If the watch is running well and everything looks OK with the movement, the watchmaker may be willing to re-tighten the 2 screws and check screw tightness on the other screws for a modest fee. 

Hope everything works out okay for you! 

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