Looks agouti, maybe Russian blue agouti (hard to tell for sure from the pictures). Blazed Berkshire markings, and looks to have rex fur.
Like Michelle said, there are different genes associated with white markings, and "high white" is a very misleading term. Personally, I hate the term because it gives the idea that anything with "a lot" of white is at risk. That's simply not true. The markings associated with Sox10 genetics are the ones that are at risk for megacolon. These markings can be combined with the safe H-locus markings. These markings can also resemble safe H-locus markings. I think that's where the confusion comes in. But to be clear, rats with a "a lot" of white are not the only ones at risk for megacolon. Rats with very little, or even no white at all, can also carry the genetics for megacolon, or even develop megacolon.
Without knowing the background of the rat in question, you don't have any way of knowing whether or not he has the potentially to carry the megacolon genes and pass them on to his offspring. You can keep him and try breeding him, but you'll want to do some very heavy inbreeding to tease it out, if it is there, and be prepared for the worst just in case.
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