An earlier post asked why W502s were designated as "W" cards even though they weren't issued in strips. My understanding is that the "W" designation refers to cards issued without any associated product. So, exhibit cards were properly catalogued as "W" cards, and W502s may have been properly designated too. We just don't know because we don't know if the W502s were issued with a product, though Burdick apparently believed they were not. The "W" designation was never meant to refer to strip cards alone. It just so happens that many cards issued without a product are also strip cards.
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