In order to insure or sell an instrument or a bow you need a value appraisal (a document with a short description and appraisal of the object) or – usually from a value of €10.000,00 and more – a certificate (a document with photographs and an exact description of the instrument as well as a precise designation as to age, place of origin, maker or school). I can issue you both, provided the instrument or the bow can be attributed.