'Forgery' means an imitation intended by the maker or any other person to deceive as to authorship, origin, date, age, period, provenance, culture, source or composition, which at the date of the Sale had a value materially less than it would have had if the Lot had not been such an imitation, and which is not stated to be such an imitation in the description of the Lot given in the Catalogue
Its also generally thought that Japanese print runs are smaller than English for comparable sets
Shadowless versions are rarer than the Unlimited printing and, thus, they demand steeper price tags
or (b) the only method of establishing at the time of publication of the Catalogue that the Lot was a Forgery would have been a scientific process not then in general usage, or which would have been too costly or impractical or would have been likely to cause damage to the Lot