Original sentence: These coins circulated until the Royal Mint again struck large quantities of silver coin in 1816, when Boulton's were withdrawn
Edited sentence: Though Boulton was not as successful in defeating counterfeiters as he hoped (high quality fakes arrived at the Bank's offices within days of the issuance), these coins circulated until the Royal Mint again struck large quantities of silver coin in 1816, when Boulton's were withdrawn