No true philatelist would pass up an 1860s stamped Pony Express envelope, now valued at as much as $50,000. No wonder Rita Braver can find dedicated stamp collectors in all sorts of places. Originally ...

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63,860. That’s how many stamps Jim Shriver, 88, has in his vast collection. “I started an Excel file to keep track,” Shriver said. “About 40,000 of those are individual stamps.” He later added: “I ...