Vintage Tupperware 8 oz stackable mugs. Set of 4. Like new condition

The product in the image is a vintage Tupperware stackable coffee mug. The mugs are part of the Tupperware model 1312 series, which was manufactured in the United States during the 1970s. They are made of durable plastic and are designed to be stackable for easy storage. The mugs were originally sold in various "Harvest Colors" including orange, yellow, green, and brown. 4