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fkwW cards = sold without a product.
ie. in boxed sets ('39 Cincinnati & St.L team sets, Berk Ross), through machines (Exhibits), for an album, or in sheets or strips.
W is correct for a boxed set. A "W" card is a strip card, or can be a boxed set, or Exhibit card, premium (W554), etc.
Some sets are messed up because of lack of info when the ACC was put together. The R315 and R316 should be "W" cards. W503 and maybe W555 and W502 should be "E" or "F" cards. W600 should be an "M" card.