Hi Jay, valid points, and there are certainly a lot of sets out there that were issued in multiple years. The W573 set has three distinctly different versions, one of which has never been reported before (as far as I know). There is a definite distinction between the three, especially these newly identified Type 3 cards, and I believe the DeVormer card seals the deal of these being separate issues. I have seen two Type 3 DeVormer cards, and both have Boston team designations.
Here is a scan of the three types of W573 that I detailed in my other post:
https://www.net54baseball.com/showthread.php?t=278804 I think it is fairly easy to see each W573 type differs substantially from each other, but I have also spelled it out below
Top Row - Type 1 - B/W, hand cut, thin card stock
Middle Row - Type 2 - Either Sepia or Green tinted, hand cut, thin card stock
Bottom Row - Type 3 - B/W, machine cut, larger size than either Type 1 or 2, much heavier card stock
Brian