Patek Philippe

If I buy from a legit grey market dealer instead of an AD will I be able to send my watch to Patek or a Patek authorized service center to be repaired after the warranty expires. I understand they will not honor the warranty, but will they refuse to work ... 

You can always bring it to Patek for servicing. Besides they don't know where you bought it (grey market or AD) Grey market will be without warranty but they will fix it, only you'll pay for it. If it needs to be serviced I would send it to Patek and not ... 

The official Patek warranty period covers grey market watches too. By definition a grey market watch is a pre-owned watch and the Patek warranty is transferable from the first owner to subsequent owners.

The warranty follows the watch IF it was properly completed and stamped/signed by the AD at the time of the original sale. If you buy from a gray market dealer and he provides with with a Certificate of Origin that was properly completed by the original A...