Daily entries from the 17th century London diary
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Peter Blondeau was employed by the Commonwealth to coin their money. After the Restoration, November 3rd, 1662, he received letters of denization, and a grant for being engineer of the Mint in the Tower of London, and for using his new invention for coining gold and silver with the mill and press, with the fee of 100l. per annum (Walpole’s “Anecdotes of Painting”).
First milled pieces of coin to prevent the use of Pen Knife from taking a few scrapeings before handing coin to the next victim.
There are more details on early English (and Scottish) milled coinage here http://www.kenelks.co.uk/coins/earlymilled/earlymilled.htm (Second half of the page for Blondeau).
It appears that Peter Blondeau himself had very little direct involvement in the post-Restoration coinage.