antique white porcelain keyhole peephole cover Victorian vintage door hardware, acanthus leaf ironstone

Antique white porcelain peep hole keyhole cover for a skeleton key lock on a Victorian era door. This shows wear and age, but no chips or cracks. It's a flat backed pendant shape about 2 1/2" long overall. This would work well for a pull on a light or a fan chain switch too, I think.