The fact that silver service was used to strike Newark siegecoins can be seen on some coins by the hallmarks and tracesof designs from the original silver plate. Others were struckon planchets that were produced by melting the silver serviceinto sheets and cutting the sheets into the desired shape andweight.

Much has been written about the emergency conditionsassociated with minting siege coins. Time, materials, andthe absence of skilled die makers contributed to their crudeappearance. Coins were misspelled, soft struck, off center, anddouble struck. Yet, despite these issues, the obsidional coinsof the English Civil War were minted close to the Englishstandard, guaranteeing their acceptance by the garrison andlocal citizenry in payment for goods and services. Given theadherence to standard, is it possible that one of these siegecoins was struck on the wrong planchet?

To read the complete article, see:
NEW BOOK: SIEGE COINS OF THE WORLD 1453-1902(https://www.coinbooks.org/v24/esylum_v24n27a04.html)