I bought my Chronostop from a seller on Chrono 24. You will hear mixed reviews about it being over priced/items not as described etc. However...
I did my research, knew what I was looking at, and contacted the seller directly on the phone number listed. He was a watch maker from the south coast, extremely helpful and knowledgeable. I struck a deal out of Chrono24 for a price that suited us both. Read the reviews on the seller and research before you commit.
I have since had another watch serviced by him, and have had a very good experience.