Lot Essay
Helmet bowls of the Kamakura period are rare and do not appear on the open market very often. This example is particularly remarkable in being in its original condition with the sole exception that at some time a new koshimaki [lower horizontal plate] was fitted, a common procedure when helmets were re-used, and the helmet bowl was reversed. Oddly enough, the shape of the bowl lends itself to being mounted the wrong way round and the overall effect probably benefits from it. Examination of the interior of the bowl indicates that it was originally mounted in the conventional way and the reason for reversing it is hard to determine, but one possibility is that this was done by one of the Ainu people of Northern Japan, a supposition which is supported by the lack of decoration, suggesting a relatively unsophisticated origin. It remains to be explained, however, why the bowl has been reversed.