Information about reference source: Marsh, The Gold Half Sovereign

The book presents a comprehensive list of all half sovereigns issued, with varieties listed and photos of each type.
The book is a continuation of the author's research on his classic, "The Gold Sovereign".

Coin dealers and collectors quote the references in this book as "MM" or "M.A.M.", e.g. MM 400 is a 1817 half sovereign.

Editions:

1982 The Gold Half Sovereign by Michael A. Marsh, published by Cambridge Coins, First Edition, ISBN 0950692913
2004 The Gold Half Sovereign by Michael A. Marsh, published by Cambridge Coins, Second Edition, ISBN 9780950692951

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