18th century musket for identification

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Matthieu Willemsen has confirmed that the musket would have been made between 1755 and 1765. He said Colonel Ruysch had a regiment in the Dutch army from 1748 to 1765. Ruysch would have purchased the musket from the Corbau family of gunsmiths. The letter E on the thumb plate would represent the 5th company in the regiment. He was nobility. He feels the saber was added and the the cock might be from a British Brown Bess. He will contact me will anything else that turns up. A wonderful source of knowledge