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Greg EcklundStan Musial's Plaque used to say "Named on 12 All Star Teams" near the end of it. The actual number is 24, and occasionally Musial would correct this by drawing a line from the 12 and writing in "24" when signing the postcard.
The Hall has since corrected the plaque and replaced the 12 with 24, so serious collectors of signed Hall of Fame postcards should look out for the newer corrected variation and the older variations that were corrected in sharpie by Musial.