AN ENGLISH DRINKING GLASS, CIRCA 1780, with a funnel

AN ENGLISH DRINKING GLASS, CIRCA 1780, with a funnel bowl engraved to the border with "Colonel Roberts Sept 12 1780" (date later altered), above a slender plain stem and shallow conical foot. 12cm
It is likely that Colonel Roberts may be Samuel Wilday Roberts who, as a Captain, is listed in the List of Field Officers in July 1761 then subsequently in command of a Garrison in Maine during the American War of Independence serving with great distinction.