Vintage Pyrex Americana Blue Mixing Bowls

This multi-tone blue Pyrex is referred to as "Americana Blue". They have white rims, and each base is a different shade of blue. They came as a 3 piece set, which included a small 1.5 pint light blue 401, a medium 1.5 quart aqua 402 and a large 2.5 quart royal blue 403. It was made from 1967-1969. This set is one of the harder to find sets.