I have a beautiful but neglected old flintlock fowling piece with a barrel marked "LONDON" on one of the flats (octagonal barrel transitioning to round) and a lock marked "W ALLPORT" on the outside and stamped "WA" on the inside. Style of the gun (stock, butplate, etc) appears to be from the period of early 1800s or late 1700s. Does anyone have any information on when W Allport may have been actively making locks?