That is what some people call a high white 50/50 or a desert abberant cal king.
mixes of bannana Cal king (aka Newport phase x abberant S.D locales0 ) with desert striper (Scissor crossing locale-desert phase striper) may be the base ingredients. But there may be other hight white desert cal king mixed with abberrant coast cal in it as well.
What someones goal was is to breed out the yellow coastal (yellow abberant phase) of the cal king to get more white which resembles and came from the desert phase. The reason i brought up scissors crossing locale is that is the only locale that has desert stripers cal kings and that may have been used to create the unusual large degree of white on top of the dorsal area.
Whatever the mixed locales are it is still pure california cal kingsnake with more desert phase in it than coastal phase but the abberancies came from the coastal phase cal kings and then bred back to the white desert phase. A result of many decades of breeding endevours.
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