Schoolhouse style 40s milk glass white opaque light cover replacement vintage

Schoolhouse / vintage style white milk glass opaque light cover - may be MCM or 40s era but unauthenticated. Has a flat but gently tapered center and slightly rounded point at bottom. Perfect for farmhouse style and vintage inspired interiors. Good vintage preowned condition. No chips or cracks noted. See photos for best reference of condition. One dark smudge on inner ring under lip of opening - small and not visible once installed. Measures approximately 3.75" across lip of opening. Measures approximately 8.5" at widest point.