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pyrex blue 401

SUPERB Vintage Pyrex Blue Butterprint Amish Farm No. 401 Nesting - Ruby Lane
SUPERB Vintage Pyrex Blue Butterprint Amish Farm No. 401 Nesting - Ruby Lane

Pyrex NO NUMBER Blue Nesting Primary Colors 401 Mixing Bowl - Etsy
Pyrex NO NUMBER Blue Nesting Primary Colors 401 Mixing Bowl - Etsy

Corning Glass Works (New York, USA) Pyrex 401 Blue Mixing Bowl – The Standing Rabbit
Corning Glass Works (New York, USA) Pyrex 401 Blue Mixing Bowl – The Standing Rabbit

What is the difference between the two blues? I did read somewhere that if it is not number (401, 402 etc) and the bowl itself it thicker it is from the 1940's. :
What is the difference between the two blues? I did read somewhere that if it is not number (401, 402 etc) and the bowl itself it thicker it is from the 1940's. :

401 Blue Bowls : Pyrex Love
401 Blue Bowls : Pyrex Love

Pyrex Blue Friendship Bowl 1 | Pyrex 401 blue mixing bowl wi… | Flickr
Pyrex Blue Friendship Bowl 1 | Pyrex 401 blue mixing bowl wi… | Flickr

At Auction: VINTAGE PYREX NO. 401 BLUE MIXING BOWL
At Auction: VINTAGE PYREX NO. 401 BLUE MIXING BOWL

Vintage Pyrex 401 Size 1.5 Pint in Primary Blue Made in USA - Etsy
Vintage Pyrex 401 Size 1.5 Pint in Primary Blue Made in USA - Etsy

-85- VINTAGE | PYREX | Blue 401 | Two Color Variations | EstateSales.org
-85- VINTAGE | PYREX | Blue 401 | Two Color Variations | EstateSales.org

Vintage Pyrex #401 Small 1 1/2 PT Mixing Bowl - Blue 1950's Dishware – In The Vintage Kitchen Shop
Vintage Pyrex #401 Small 1 1/2 PT Mixing Bowl - Blue 1950's Dishware – In The Vintage Kitchen Shop

Vintage Pyrex Horizon Blue 401 Mixing Nesting Bowl 1.5 Pint - Etsy
Vintage Pyrex Horizon Blue 401 Mixing Nesting Bowl 1.5 Pint - Etsy

Vintage Pyrex #401 Primary Blue 1 1/2 Pint Small Nesting Mixing Bowl | eBay
Vintage Pyrex #401 Primary Blue 1 1/2 Pint Small Nesting Mixing Bowl | eBay

3 Pyrex Bowl Set 404 403 401 Size Primary Colors Yellow - Etsy Denmark
3 Pyrex Bowl Set 404 403 401 Size Primary Colors Yellow - Etsy Denmark

Primary BLUE 401 PYREX NO Numbers Old Small Mixing Bowl - Etsy in 2023 | Pyrex, Bowl, Pyrex vintage
Primary BLUE 401 PYREX NO Numbers Old Small Mixing Bowl - Etsy in 2023 | Pyrex, Bowl, Pyrex vintage

Vintage Pyrex Primary Blue Round Mixing Bowl 401 Multi Color Set | Over the Years | Silver Spring, MD
Vintage Pyrex Primary Blue Round Mixing Bowl 401 Multi Color Set | Over the Years | Silver Spring, MD

Vintage Set of 3 Pyrex Blue & White Daisy "Colonial Mist" Milk Glass M – Jack's Daughter of All Trades
Vintage Set of 3 Pyrex Blue & White Daisy "Colonial Mist" Milk Glass M – Jack's Daughter of All Trades

Vintage Unnumbered Pyrex Blue 401 Size 1950s Primary Blue Bowl - Etsy
Vintage Unnumbered Pyrex Blue 401 Size 1950s Primary Blue Bowl - Etsy

Vintage Pyrex Mixing Bowls Yellow # 404 and Blue# 401 | eBay
Vintage Pyrex Mixing Bowls Yellow # 404 and Blue# 401 | eBay

Vintage Pyrex Primary Colors #401 Blue Mixing Nesting Bowl | eBay
Vintage Pyrex Primary Colors #401 Blue Mixing Nesting Bowl | eBay

Vintage Pyrex 401 Primary Blue Nesting Mixing Bowl - Etsy
Vintage Pyrex 401 Primary Blue Nesting Mixing Bowl - Etsy

Vintage Pyrex #401 Small 1 1/2 PT Mixing Bowl - Blue 1950's Dishware – In The Vintage Kitchen Shop
Vintage Pyrex #401 Small 1 1/2 PT Mixing Bowl - Blue 1950's Dishware – In The Vintage Kitchen Shop

Pyrex Turquoise Mixing Bowl 401 Small Aqua Blue Pyrex Nesting - Etsy
Pyrex Turquoise Mixing Bowl 401 Small Aqua Blue Pyrex Nesting - Etsy

Pyrex Primary Mixing Bowl Blue Smallest of Set 401 Old Mark - Etsy
Pyrex Primary Mixing Bowl Blue Smallest of Set 401 Old Mark - Etsy

PYREX Primary BLUE 401 Small Mixing Bowl / Pyrex Blue Bowl - Etsy in 2023 | Blue bowl, Pyrex vintage, Pyrex
PYREX Primary BLUE 401 Small Mixing Bowl / Pyrex Blue Bowl - Etsy in 2023 | Blue bowl, Pyrex vintage, Pyrex

Vintage Pyrex Blue Primary Colors 1950's Nesting Mixing Bowl #401 | eBay
Vintage Pyrex Blue Primary Colors 1950's Nesting Mixing Bowl #401 | eBay

Pyrex | Kitchen | Pyrex 4 Vintage Reverse Primary Solid Bold Blue 1 12 Pt Mixing Bowl | Poshmark
Pyrex | Kitchen | Pyrex 4 Vintage Reverse Primary Solid Bold Blue 1 12 Pt Mixing Bowl | Poshmark

Vintage Pyrex Primary Blue 401 Mixing Bowl 1.5 Pint DWD | eBay
Vintage Pyrex Primary Blue 401 Mixing Bowl 1.5 Pint DWD | eBay