For example, that mixing bowl set of Mom’s sells for $40 ... TIP:Pieces from 1915 to 1970, pink items and vintage Pyrex in primary colors seem to be the most valuable and sought-after.

Vintage kitchenware ... found a pine tree-patterned Pyrex test piece that sold online for more than $6,000. Bazzo said that a set of four nesting mixing bowls in a primary color would have ...