[OHNE G-Nachweis]
I have put 2010-01-01 as the start of the warranty, but I don't actually have the warranty card, since I bought the watch at an auction. 
I think there is a loose part in the clockwork mechanics, and the watch stops shortly after it has been rewound. Also the needles of the watch are loose, so they move when you shake your wrist.

I hope you can fix it.

Kristian

Ps. the model of the watch is a Pionier Newport, but that wasn't an option under "Reference number".