David Groom's excellant new book arrived yesterday, and the bird's foot is illustrated! Interestingly he states it is found in lots of years for GeorgeV pennies. I wonder if others are associated with die cracks, and whether there is any correlation with the degree of ghosting on the reverse. I found a 1913 penny today, with the same birds foot flaw. And when I play with the pictures of my example I can get the folds in the dress to match up against the neck flaw, it's got to be a clashed die. But I'd never seen this flaw on anything other than the 1918kn, so this is a first for me. Pictures attached of the 1913 and also my comparison shots. (the yellow is from the reverse, which overlays the flaw indentically). Just in case anyone else finds it interesting!