A fine cello bow made by a member of the Knopf family, most likely Christian Wilhelm around 1830.  It's a beautifully made bow made from a fine pernambuco with mounts in horn and ivory.  The frog has been made without a metal underslide which was common on bows made before 1840 and in our opinion adds to the warmth and richness of the tone this bow produces.  
 
It draws a wonderfully rich, warm steady tone.  Incredibly comfortable to use and can cope well with faster passages.  This bow would be more than suitable for an advancing student or professional. 
 
The weight is