18th /early 19thc antique pewter old charger /plate

a nice english or american pewter plate 9 1/2" .it has a raised rim and looks like t are 2 or 3 markings on bottom.i can not make out any of markings. i tried my best to picture markings. plate has had years of wear and oxidation is present on back. any questions please ask .found locally. being sold in as is condition.no repairs or cracks.being sold with no reserve . thanks for looking listing many more items