Chin Shun-shin's 'The Claws of the Divine Beast' (1980)

Based on a mystery by Taiwanese-Japanese author Chin Shun-shin. After two elderly men in Yokohama quarrel over a Yang dynasty artifact, one of the men turns up dead with mysterious claw marks across his face. A detective takes up the case, and uncovers secrets dating back to war crimes committed during Japan's invasion of China in WWII.