The silver one shilling coin was made in Boston in 1652, and is one of about 40 known to still exist, a Rhode Island coin expert says
Daniel Frank Sedwick, LLC Treasure: World, U.S. Coin and Paper
RCMR - 2022 #5 September/October by Professional Coin Grading
PMR - 2024 #2 March/April by Professional Coin Grading Service
Rare coin made in Colonial New England could fetch $300,000
Rare coin made in Colonial New England could fetch $300,000 at UK
RCMR - 2022 #5 September/October by Professional Coin Grading
Rare coin minted in Colonial New England sells for $350,000
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The Numismatic Collector's Series Sale - 322 by Spink and Son - Issuu
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Rare coin made in Colonial New England could fetch $300,000