Peacocks and their plumage represent good fortune, kindness, and nobility in various cultures and ­mythologies. But that doesn’t explain why this peacock feather pin fetched roughly four times its high estimate ($80,000) at Sotheby’s Dec. 5 Magnificent ­Jewels from the Collection of Mrs. Charles ­Wrightsman sale in New York City. Its rare pedigree does. Manufactured around 1860, the estate piece is a product of Oscar Massin—a designer who’s largely unknown outside jewelry circles. But his pieces are highly prized among collectors. “Massin was one of the really important French jew