After checking my W575-1 cards, it does appear the vast majority are factory cut. The ones that are not are either obviously trimmed, like the Doak example I showed, or are the W501-esque cards that have handcut, like the Danforth I showed, or rough top or bottom borders, like my Gowdy and Dave's Walter Johnson.
I have noticed that the vast majority of the 'official' W501 cards appear to have consistent machine cut left and right borders, while the tops and bottoms quite often are rough/uneven, which would indicate issuance in vertical strips (although I have seen a few rough side borders too). Unfortunately because of the long-standing blanket designation as W575-1 cards that share similarities to the W501 cards, but do not have the numbering or designation on the top, I think the grading companies will likely lump all W575-1 cards as hand cut, because that is how it was handled in the past.
Brian
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