need help identifying mark

Can anyone help me identify these two marks on an 800 silver tray? I will try to add photos, but not sure how. One mark is a capital L with a star on top, but laying on its side within a rounded cornered square. The other mark is cursive initials that look like FMS The silver piece is all hand hammered design and is very old. Possibly from late 18th century. … a.jpg.html … e.jpg.html