If you go to the market square and opposite the 'DEEP BLUE BAR' is a silver shop called 'ISTANBUL SILVER' the owner is called 'NECMI' Pronounced 'NESHME'.
I always get my silver cuflinks etc from him as he is top quality and always give me a better price than anyone else.
He will let you look without being in your face, if you do go please say "hi" from Peter & Michelle.