Many W575-1 cards appear to be factory cut, but there are plenty of strip issued W575-1 out there as well. It seems like this set was issued in different ways.
Here are 3 that I believe were issued in strip form, as vertical strips. The first and third are W575-1 card versions that Rhett identified as having the same grainy look as the W501 cards, without the 'G-4 22' printed in upper left border and printed card number on upper right border. The Danforth is freakishly wide. I believe these W501 similar cards were also issued in vertical strips, as most of the ones I have seen have a non-factory cut on top and bottom borders, or jagged as if torn off from a roll, as Rhett mentioned in the article above. The middle card has a little bit of the top border line visible on its bottom border, as well as being hand cut to photo border on the sides.
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The first two cards in the next grouping are factory cut like Leon's example, and have a Henry Johnson and Service Candy Co. stamps (by the way, both have the same street address in Alameda, CA - two companies running out of the same building?). The third and fourth in the row are just normal W575-1 cards that appear factory cut.
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The following row of Steve O'Neill cards starts with a factory cut card (despite the post-factory wear on side borders), another Service Candy Co. stamped factory cut (stamp is very faint...you are going to have to trust me on this), and two examples that I believe are strip cards that were issued in vertical strips, with the third card being a non-grainy with nicer photo and obviously being cut down after the fact to remove side borders, and the fourth being one of the W501-like W575-1 cards. It is interesting that between the two strip issued cards there is a difference in the spacing of the line containing his name and the line with the team, as well as a similar difference in this spacing between the two factory cut examples.
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Definitely a lot of versions of these cards out there, but understandably these long ago all got lumped together under the W575-1 designation because of the shared player photos.
Brian