6R5.1 Yet another '5 on 6'?
Plate Position - Plate A, Position 10.
Multiples: From the Upper Right of a mint block of at least 4 from the WLS collection.
Confidence in identification:
Notes: This stamp has bothered me for a while. Now that multiple copies have been found, I have a theory which should at least encourage discussion.
This link is to an image of the full stamp.
This link attempts to explain my theory.