The Sanke were stabilized in the first quarter of the 20th century. Sanke are a cross with Kohaku and Bekko which gives you a white koi with a red Kohaku pattern and black spots on the body. As a rule their should not be any black on the head but some of the newer Sanke that have been produced in the past few years have larger black spots and I’ve seen several with black spots that extended onto the head and were very beautiful koi. It is not a requirement for Sanke to have black stripes in their fins but it is okay if it isn’t over done