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Jaeger-LeCoultre

Is it true that such one piece cannot be open without risk of the glass breaking?

 

Just went to the local watch shop. They say that there is a risk that the glass may break if they open the casing. They indicated that this has nothing to do with them not having the 1335 wrench. Even if there is one, the risk is the same.
Can I confirm if this is true? Does anyone have similar experience when trying to service watches with such casing?

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