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Depending on the history the water resistance may already be comprimised.

Best to take it to a professional who has the correct tools and experience.

Dust on the gasket is a concern, as is dust in the movement. Rubber breaks down quickly over time.
 
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You will want to lubricate the gasket before reinstalling the case-back. People with experience know how tight to make it by feel but you might want to mark the case-back and case with a sharpie to remind yourself of how it was tightened.
 
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The seller is being very generous with allowing you to open up the watch to inspect it on a three day trial, and allowing a return if you don't like what you see, or if you just decide you don't want it. Much can go wrong with that policy. A messed up back, tinkered with movement, dust entering the watch, a botched job in replacing the back, compromised WR, lots of stuff can happen. I'm not saying you aren't capable of opening and closing the back, but it does indicate that the seller is above board in standing by what he is selling. Do you really need to open the back to inspect it? Do you think it might not be legit or a Franken watch?
 
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…Dust on the gasket is a concern, as is dust in the movement.
Yeppers.

Just got yelled at by my watchmaker last week for dust on the gasket as well as dust in the movement. He knows I do some of my own regulating and found a nice dust party going on inside one of my Speedmasters.
 
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The seller is being very generous with allowing you to open up the watch to inspect it on a three day trial, and allowing a return if you don't like what you see, or if you just decide you don't want it. Much can go wrong with that policy.
Especially a buyer who feels the need to ask strangers on the internet about opening the case.
 
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Unsure if you mentioned it being a screw-on. If so, I wouldn’t hesitate to open it up to have a look. Simply lubricate the gasket with a tiny amount of silicone when putting back together.
 
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Especially a buyer who feels the need to ask strangers on the internet about opening the case.

What’s the problem if he’s given me permission to do so?
 
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What’s the problem if he’s given me permission to do so?
What happens if you put a noticeable gouge in the case-back while attempting to open it? Happens all the time, even occasionally to people with apparently much more experience.
 
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You bet. Now, if a snap-on case back, fuhgeddaboudit. Off to the watchmaker it would go.
 
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The majority of screw-on case-backs I receive have tool marks on the back. People seem to have a lot of trouble opening them properly without professional quality tools.
 
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He was not comfortable opening up the case back, but is giving me a three day inspection period once it arrives to make sure that everything looks good.
I did have a friend who got a mismatched movement and the seller had no clue.
I’m curious… if you have to ask a forum how to open a caseback properly, what qualifications do you have to determine the correctness of the movement vs mismatched parts? If I recall, you have a number of recent posts asking for authenticity of a variety of modern watches.

If the seller isn’t comfortable opening up the watch, I doubt they would be too comfortable with someone else opening it up, when said person has to ask a forum for advice on opening the watch.
also add that if I were to damage it, and it needed to be returned to him, I’d compensate him for it.
Yeah, if this were my watch, that would be a hard no. You damage my watch trying to self inspect it, the return offer is void. Just take the watch to a watch maker and have them do this, which is what I assume the seller is thinking is going to happen anyways.
 
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You bet. Now, if a snap-on case back, fuhgeddaboudit. Off to the watchmaker it would go.

It’s screw down!
 
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You won’t know if you’ve resealed it properly without doing a pressure test. even if you follow all the guidance above.

If the watchmaker who serviced the watch found out or could tell it had been opened by a third party, it would likely void their warranty