Vintage Prolon Ware Melamine Divided School Lunch Trays Blue Green Lot of 4

Vintage Prolon Ware Melamine Divided School Lunch Trays Blue Green Lot of 4 This set of plates in really good condition. The dark blues ones are really great shape, on compartment has some utensil scratches (see photos). The green ones I believe are older. They are clean on the front sides. The backs are clean, but there is some dark discoloration that I tried to show in the photos. They measure approximately 14.5" x 9.75"