Large Antique Pewter Charger From The Late 1700's

Very large antique English pewter charger from the late 1700's. This charger has English Tudor and Rose touch marks and another touch mark we can not identify. Initials on the back which probably belonged to the original owner are L. I. S. This large charger has a beautiful patina and is rare for it's age and size. It measures approx. 18 1/4" across.