Watch service question

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Sending my 1997 GMT-Master II Rolex to be serviced at the RSC and received the following quote for replacing the hands and crystal in addition to servicing the movement. I know that I shouldn't replace the hands if I want to keep it all original but is there any harm in replacing the crystal? I did not notice any chips or cracks when I had the watch but don't know if there was something more minuscule that I missed.

Thanks in advance!