Thank you very much for your advice.
Unfortunally, I do not know how to attach the image - I will try to find out.
On chrono24, I found a new black one in Italy, available imidiately, which I bought. AD in Copenhagen has replaced it. Even the original strap was brown, black one looks nice too.
When we talk Patek models, ADs in Copenhagen do not have in the store in the moment, they always talk loooong delivery time - same case seems to be with the strap.
Once more time, thanks a lot.
Kind regards
Michael