Welcome to the forum. I've had two GMTs serviced at RSC Dallas this year, and their base price for a full service, including bezel insert/crown/case tube replacement is $550. I've had the chrystals replaced on both of them, and that added (I believe) $135 to the price. You can pay less by going to an independant watchmaker with a Rolex parts account, but personally I prefer to use the RSC.
Mark
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