Vintage Clip On lens hood Filter Holder 3cm In Diameter

This is a Vintage Clip On lens hood Filter Holder 3cm In Diameter. 

In good condition, it would have clipped on to the lens of a folding camera. They were made to hold lens filters which were often homemade from gelatin.

It has no maker's mark but could be Actina, BPL or Handcross

A nice little addition to accessorise your vintage camera.