Pyrex 401 402 Early American Mixing Bowls 1 1/2 Pint 1 1/2 Quart 1960's

Vintage Mixing Bowls
2 Matching
Pyrex
Models 401 and 402
Circa 1960's - See Notes Below
Early American Pattern
Made 1962-1971
Vibrant Colors
Clean Condition
1 1/2 Pint Size
and 1 1/2 Quart Size
401 is 5 11/16" Across x 3 3/8"
402 is 7 1/4" Across x 3 5/8"
Estate Find
Thank You For Looking

So I Am Certainly No Expert
But My Research Has Shown
That The Original 1940's Pyrex Pieces
Had No Numbering And No
Pint or Quart Size Designations
The 1950's Pieces
Had Number / Size Designations
But No Pint or Quart Designations
The 1960's - Early 1970's Pieces
Have Both Numbers/Size Designations
And Pint and Quart Designations
Around 1975, The Pieces Started
To Have Metric Designations
I Hope This Information Assist
You In Your Collecting Endeavors