I bought a $8,000 Cartier Tank Jan 2017, I've adjusted it 3 times due to inaccurate time. After one repair, one morning I wanted to wear to work and found it 18 minutes faster. Feedback from Cartier USA follows: Cartier Dear Ms. Tsang, Thank you for the interest that you have expressed in Cartier. The movement calibre 157 has an allowable tolerance of -0.1 + 0.4 seconds per day, meaning over a certain period, the time showing on the watch can be an accumulation of this variance, whether ahead or behind the actual time. Kindly note, the Client Relations Center of North America does not have a specific "regional manager" that may be contacted. We of course do have a management team that does handle client feedback for North America. Currently, the Client Relations Center is partnering with your local boutique to provide you with a solution. Yours sincerely, Zach Cartier Relations Center 1-800-227-8437