Shah/White Mikado is probably just a renaming of Potato Leaf White.
If you look back at the Henderson seed catalog of 1890 or so, they were the ones who released Shah as a large golden variant of their Mikado. So if Shah is similar to anything we grow today, it would look like Aunt Gertie's Gold/Yellow Brandywine/Elbe (the three are similar in being light orange potato leaf large fruited varieties).
However, Shah was only offered for a few years and disappeared from catalogs before 1900. It is likely that they had something unstable (just a cross of their large pink Mikado, possibly).
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Craig
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