Vincent, I can highly recommend Paebke in Düsseldorf. Last year I bought on ebay a Cord "in very fine condition".
When it arrived it was a ruin, rust and filth, the self timer was broken, cable release socket gone, shutter only partly working. Against evrybody's advice I decided to have it restored. Paebke did it - 300€ - and since then it has produced plenty of excellent negatives.
good luck.