Hey mate, a swimming pool and swimming is a very different circumstance for the watch from the water resistant perspective. Swimming and putting the watch deeper under water will create more pressure then just putting it in a small bowl with water. And it is very unlikely that you will be able to see the water running into it. If something gets in it will be only some small drops but they can result in rust on your movement which will eventually cause much damage over time.
Waterproofing a watch doesnt mean you treat it with a special coating or something, it does mean that all gaskets are checked for damage and silicon grease will be put on them. Eventho 70-90% of all reps are waterproof to a certain degree you can never be sure unless you have the watch „waterproofed“ and checked with a pressure test by a professional, or by yourself if you have the tools. Now if you paid for it to be waterproof i think the TD will take care of it but return the watch if it is not waterproof can be very annoying. If you really want to have it waterproof, buy the tools and learn how to do it, or search a watchmaker in your area and ask him to do it… thats the best way in my opinion.
always check the crown befor submerging it , thats the first step
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