Any feedback on watchmaker: Mr Sudarson at www.oldswisswatches.com?

Hi Guys,
This watchmaker is in India. His name is Sudarson and he runs the website www.oldswisswatches.com. He sold me some parts of a vintage Zodiac caliber and he seems to have all the parts for this watch.
I am wondering how can I get a kind of guarantee that an unknown to me watchmaker will send my watch back, of if he even is a watchmaker... Also is there someone in the forum who had experience with Mr Sudarson?

Thanks for replying,
Panos