Vintage Milk Glass Plate

A very pretty collectible plate in milk glass. It measures approximately 9 1/2”, has a beautiful detailed lace edge and displays “fire” when held up to the light. It has minor imperfections: a dot in the center, most likely from production, a tiny nick on the back - please see photos. The marking on the back appears to be a triangle with MP. If you know the manufacturer, I’d love to know!