Dollis Hill ST5(6) 2d with honeycomb pattern Green phosphor ink

Stamps were printed with a honeycomb of phosphor dotes. The phosphor bands are (mainly) five rows of five phosphor dots the size of a pin head and reacting Green after exposure to Ultra Violet light. The word honeycomb was used by Forster to describe this phosphor pattern. They are a most unusual format and stamps have never been issued with this phosphor pattern. Few exist .Gummed block of 15. Cat 7500 pounds. Ex Edward Klempka Author of the DOLLIS HILL FIND illustrated on page 23