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fkwHere is the "fireworks" one (#20). It is so far uncataloged in the 2006 SCD book. The set is listed as "1920 W519- Numbered 2" on page 527, but there are only 2 cards in the checklist (no Ruth). It is the rarest, I have seen 2 on eBay in 5 years including the one I own.

Frank W