The Tupperware 841-3 model is a square Servalier replacement lid, specifically designed to fit the #840 series bowls and canisters. Specifications & Compatibility Dimensions: It measures approximately 6.5" x 6.5". Matching Bowl: This lid is the correct fit for the Tupperware #840 square bowl. Design: It features the signature starburst or "one-touch" sunburst pattern that allows you to seal the container by pressing firmly in the center. Vintage Period: These were primarily manufactured during the 1960s and 1970s as part of the Harvest and Servalier collections.