exists and is an alternate of . Regular Patek Philippe watches cost in the range of $10,000-$30,000. However, Patek Philippe currently sells the most expensive watch in the world, valued at roughly $1,000,000. Patek Philippe has been known to sell watches to royalty. Regular Patek Philippe watches cost in the range of $10,000-$30,000. However, Patek Philippe currently sells the most expensive watch in the world, valued at roughly $1,000,000. 