The plates pictured are vintage Lefton Fleur de Lis 3512 luncheon or snack plates, likely from the mid-20th century. They are white with a gold trim and feature a pattern of small fleur-de-lis symbols. These plates typically measure around 8 inches in diameter and were often sold in sets. Luncheon plates are smaller than dinner plates, usually around 9 inches, and are suitable for lighter meals like sandwiches or snacks.