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.
Attachment 607268Attachment 607269
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.
Attachment 607270Attachment 607271
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.
Attachment 607272Attachment 607273
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