Page 51 - Frank Walton GB Queen Elizabeth II Wildings

2½d Carmine-Red

Tudor Crown Watermark

White near-vertical line caused by a very
small piece of dirt being lodged under the
doctor blade. If the foreign matter is small
enough, then all of ink from the pale areas
is removed - but only some of the ink from
the dark areas. This creates the impression
of an intermittent line.

Reference: Williams Fundamentals of Philately,
revised edition, pp286-287.

Tudor Crown Watermark
Dry print leaving six stamps completely omitted.