'Nordic Type 1B'
I think the protagonist was classified as the Nordic Type 1B, after the "medical examination" of his eye color, hair color, skull length/proportion
I was wondering if "Nordic Type 1A" was somebody with even lighter hair and/or eyes and/or bigger skull (or whatever they measured)
I know it's all pseudoscience, but even so, based on it, I am sure a lot Slavic with extreme light hair and eyes could have achieved the highest, or nearest the highest race classification. Yet, Slavs were treated nearly as bad as the Jews.
Blond & blue eyed Russian POWs were starved to death in the open camps, while dark eyed & dark skinned US POWs were kept in a relative comfort. So, it's seems even the internal logic of Nazi pseudoscience was badly broken.