Atlas Mason Jar

what do the numbers on the bottom of blue ball mason jars mean?

I see on Ebay someone said #13 was rare. Then others have numbers 1, 2, 7, 2 F, etc.
what do these numbers on the bottom of these blue and clear Atlas and Ball jars mean?
well a 13 is selling for $20 and a 2 is selling for $5 so there must be some difference.

its the mold number the jar was cast from

Vintage ATLAS H Over A MASON Canning Fruit Jar Quart Clear Gray Zinc ATLAS Lid
Vintage ATLAS H Over A MASON Canning Fruit Jar Quart Clear Gray Zinc ATLAS Lid
$5.99
Time Remaining: 6h 8m

LK HAZEL ATLAS MASON HALF GALLON CANNING JAR ATLAS PORCELAIN ZINC LID
LK HAZEL ATLAS MASON HALF GALLON CANNING JAR ATLAS PORCELAIN ZINC LID
$13.99
Time Remaining: 6h 9m

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 10h 50m

3 Clear 16 oz Mason Atlas Canning Fruit Jars no lids
3 Clear 16 oz Mason Atlas Canning Fruit Jars no lids
$11.95
Time Remaining: 11h 54m

Masons Patent Aqua Quart Jar no number hand blown  with Atlas Zinc Lid
Masons Patent Aqua Quart Jar no number hand blown with Atlas Zinc Lid
$9.95
Time Remaining: 12h 15m

Atlas Mason Improved Patd Crude
Atlas Mason Improved Patd Crude
$4.99
Time Remaining: 12h 25m

Antique Mason Jar Atlas Strong Shoulder Bubbles in Glass Ceramic insert in lid
Antique Mason Jar Atlas Strong Shoulder Bubbles in Glass Ceramic insert in lid
$75.00
Time Remaining: 14h 30m
Buy It Now for only: $75.00

Ultra rare and early atlas special edition wide mouth mason jar green blue
Ultra rare and early atlas special edition wide mouth mason jar green blue
$74.99
Time Remaining: 14h 45m

Vintage Blue Glass ATLAS Strong Shoulder Mason Canning Jar Pint Size Zinc Lid
Vintage Blue Glass ATLAS Strong Shoulder Mason Canning Jar Pint Size Zinc Lid
$5.00
Time Remaining: 1d 3h 30m

Vintage Clear Glass Hazel Atlas H over A pint Square Canning Mason Jar Bottle
Vintage Clear Glass Hazel Atlas H over A pint Square Canning Mason Jar Bottle
$8.99
Time Remaining: 1d 4h 6m

ATLAS EZ SEAL DROPPED A E Z SMALL PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
ATLAS EZ SEAL DROPPED A E Z SMALL PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
$4.95
Time Remaining: 1d 12h 40m

HALF GALLON ATLAS EZ SEAL DROPPED A E Z JAR OLD VINTAGE MASON WIRE BAIL GLASS HG
HALF GALLON ATLAS EZ SEAL DROPPED A E Z JAR OLD VINTAGE MASON WIRE BAIL GLASS HG
$6.95
Time Remaining: 1d 13h 44m

Rare and early Gteen atlas masons patent quart jar
Rare and early Gteen atlas masons patent quart jar
$29.99
Time Remaining: 1d 15h 23m

11 Antique Vtg Atlas Mason Quart Canning JarsStorage Crafts Weddings
11 Antique Vtg Atlas Mason Quart Canning JarsStorage Crafts Weddings
$24.99
Time Remaining: 2d 31m
Buy It Now for only: $24.99

Fruit Jar Atlas Mason Improved
Fruit Jar Atlas Mason Improved
$9.99
Time Remaining: 2d 4h 33m

BLUE AQUA SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
BLUE AQUA SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
$6.95
Time Remaining: 2d 6h 21m

Lot of 7 Vintage Mason Canning Jars CrownBallAtlas Glass w Bales or Zinc Lids
Lot of 7 Vintage Mason Canning Jars CrownBallAtlas Glass w Bales or Zinc Lids
$29.95
Time Remaining: 2d 7h 45m

Mason Jar ATLAS Mason Improved wide mouth pint porcelin cap and zinc collar
Mason Jar ATLAS Mason Improved wide mouth pint porcelin cap and zinc collar
$9.50
Time Remaining: 2d 11h 15m
Buy It Now for only: $19.00

Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
$14.00
Time Remaining: 2d 11h 20m
Buy It Now for only: $24.00

Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars Zinc Lids
Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars Zinc Lids
$49.99
Time Remaining: 2d 12h 6m

LOT of 4 Vintage ATLAS EZ SEAL Blue Aqua Mason Jars w Glass Lids Pint Size
LOT of 4 Vintage ATLAS EZ SEAL Blue Aqua Mason Jars w Glass Lids Pint Size
$49.99
Time Remaining: 2d 12h 6m

Lot of 4 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lids Clean
Lot of 4 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lids Clean
$29.99
Time Remaining: 2d 12h 11m

Vintage ATLAS Blue Aqua Mason Jar w Glass Lid Pint Size Squat Squatty type
Vintage ATLAS Blue Aqua Mason Jar w Glass Lid Pint Size Squat Squatty type
$24.99
Time Remaining: 2d 12h 14m

Vintage ATLAS EZ SEAL Blue Aqua Mason Jar Pint Size w Glass Lid Excellent Clean
Vintage ATLAS EZ SEAL Blue Aqua Mason Jar Pint Size w Glass Lid Excellent Clean
$19.99
Time Remaining: 2d 12h 16m

GREEN BLUE AQUA ATLAS E Z SEAL CANNING FRUIT JAR OLD ANTIQUE WIRE BAIL MASON EZ
GREEN BLUE AQUA ATLAS E Z SEAL CANNING FRUIT JAR OLD ANTIQUE WIRE BAIL MASON EZ
$5.95
Time Remaining: 2d 12h 45m

ATLAS MASONS PATENT FRUIT JAR BUBBLES ZINC PORCELAIN LID RARE ANTIQUE BIM EMB
ATLAS MASONS PATENT FRUIT JAR BUBBLES ZINC PORCELAIN LID RARE ANTIQUE BIM EMB
$9.95
Time Remaining: 2d 12h 59m

BLUE GREEN ATLAS E Z SEAL DROPPED A SMALL PINT JAR OLD MASON WIRE BAIL GLASS LID
BLUE GREEN ATLAS E Z SEAL DROPPED A SMALL PINT JAR OLD MASON WIRE BAIL GLASS LID
$6.95
Time Remaining: 2d 13h 2m

BLUE AQUA SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
BLUE AQUA SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
$5.95
Time Remaining: 2d 13h 24m

LIGHT GREEN SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
LIGHT GREEN SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
$8.95
Time Remaining: 2d 13h 38m

Vintage Pint Size HAZEL ATLAS Clear Glass Mason Jar w Glass Lid
Vintage Pint Size HAZEL ATLAS Clear Glass Mason Jar w Glass Lid
$21.99
Time Remaining: 2d 13h 43m

LIGHT PURPLE ATLAS MASONS PATENT 56 OZ CANNING JAR W ZINC LID
LIGHT PURPLE ATLAS MASONS PATENT 56 OZ CANNING JAR W ZINC LID
$19.99
Time Remaining: 2d 13h 45m

BEAUTIFUL APPLE GREEN ATLAS E Z SEAL CANNING FRUIT MASON JAR ANTIQUE + GLASS LID
BEAUTIFUL APPLE GREEN ATLAS E Z SEAL CANNING FRUIT MASON JAR ANTIQUE + GLASS LID
$15.95
Time Remaining: 2d 13h 49m

MASONS PATENT NOV 30 TH 1858  Atlas Anchor Hocking JARS ALUMINUM LIDS
MASONS PATENT NOV 30 TH 1858 Atlas Anchor Hocking JARS ALUMINUM LIDS
$30.00
Time Remaining: 3d 2h 41m
Buy It Now for only: $30.00

J 89 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lid 4 E
J 89 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lid 4 E
$12.99
Time Remaining: 3d 3h 1m

Antique Atlas Improved Mason Glass Canning Jar light Greenish Blue Tint 42
Antique Atlas Improved Mason Glass Canning Jar light Greenish Blue Tint 42
$14.99
Time Remaining: 3d 9h 31m
Buy It Now for only: $14.99

Atlas Improved Antique Mason 1800s Glass Fruit Jar Old Aqua 40
Atlas Improved Antique Mason 1800s Glass Fruit Jar Old Aqua 40
$14.99
Time Remaining: 3d 9h 31m
Buy It Now for only: $14.99

Large 1800s Glass Jar Atlas Strong Shoulder Mason Bottle Great Air Bubbles 26
Large 1800s Glass Jar Atlas Strong Shoulder Mason Bottle Great Air Bubbles 26
$14.99
Time Remaining: 3d 9h 41m
Buy It Now for only: $14.99

Antique 1800s Patent Atlas Glass Mason Jar Great Bubbles Fruit Bottle 10
Antique 1800s Patent Atlas Glass Mason Jar Great Bubbles Fruit Bottle 10
$14.99
Time Remaining: 3d 10h 16m
Buy It Now for only: $14.99

Antique 1800s Atlas Mason Improved Patd Glass Jar Bottle Unique 28
Antique 1800s Atlas Mason Improved Patd Glass Jar Bottle Unique 28
$14.99
Time Remaining: 3d 10h 16m
Buy It Now for only: $14.99

1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 3d 12h 30m

ROOT MASON GREEN PINT FRUIT JAR  BOYDS ATLAS ZINC LID
ROOT MASON GREEN PINT FRUIT JAR BOYDS ATLAS ZINC LID
$9.99
Time Remaining: 3d 13h 15m

Antique ATLAS STRONG SHOULDER MASON Canning Glass Jar Clear Old Vtg 1 Quart
Antique ATLAS STRONG SHOULDER MASON Canning Glass Jar Clear Old Vtg 1 Quart
$9.99
Time Remaining: 3d 13h 47m

rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
$9.95
Time Remaining: 4d 8h 59m

Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
$15.95
Time Remaining: 4d 9h 57m

VINTAGE ATLAS STRONG SHOULDER MASON BLUE CANNING JAR 7 1 4  TALL W ZINC LID
VINTAGE ATLAS STRONG SHOULDER MASON BLUE CANNING JAR 7 1 4 TALL W ZINC LID
$9.99
Time Remaining: 4d 10h 43m

Atlas Masons Patent and Ball Mason quart jars w air bubbles no big chips
Atlas Masons Patent and Ball Mason quart jars w air bubbles no big chips
$22.00
Time Remaining: 4d 13h 25m

Lot of 4 blue mason jars 2 ball 1 Atlas 1 Masons
Lot of 4 blue mason jars 2 ball 1 Atlas 1 Masons
$2.24 (3 Bids)
Time Remaining: 4d 16h 26m

VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$35.95
Time Remaining: 4d 23h 50m
Buy It Now for only: $35.95

Vintage Atlas Strong Shoulder pint mason jar
Vintage Atlas Strong Shoulder pint mason jar
$2.00
Time Remaining: 5d 6h 19m

Vintage Blue ATLAS Strong Shoulder Mason 1 2 Half Gallon Jar Zinc Lid
Vintage Blue ATLAS Strong Shoulder Mason 1 2 Half Gallon Jar Zinc Lid
$8.99
Time Remaining: 5d 9h 13m

Vintage 1920s ATLAS E Z Seal Pint Size Mason Jar Wire Bail  Glass Lid Seal
Vintage 1920s ATLAS E Z Seal Pint Size Mason Jar Wire Bail Glass Lid Seal
$4.99
Time Remaining: 5d 9h 29m

OLD FRUIT JAR ATLAS EASY SEAL PINT WITH ORIGINAL LID MASON JAR
OLD FRUIT JAR ATLAS EASY SEAL PINT WITH ORIGINAL LID MASON JAR
$6.99
Time Remaining: 5d 12h 27m
Buy It Now for only: $6.99

Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
$14.99
Time Remaining: 5d 12h 53m

Old Embossed 5 Aqua Atlas Mason jar Zink Lid
Old Embossed 5 Aqua Atlas Mason jar Zink Lid
$9.99
Time Remaining: 5d 13h 32m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 5d 13h 56m
Buy It Now for only: $33.99

Atlas Strong Shoulder Mason Light Cornflower Blue
Atlas Strong Shoulder Mason Light Cornflower Blue
$4.99
Time Remaining: 6d 2h 10m

2 Atlas Strong Shoulder Mason Quart Jars W Atlas Boyds Porcelain Zinc Caps
2 Atlas Strong Shoulder Mason Quart Jars W Atlas Boyds Porcelain Zinc Caps
$19.99
Time Remaining: 6d 5h 40m
Buy It Now for only: $19.99

Lot of 3 Old Antique Half Gallon Fruit Jars Mason 1858 Atlas and Rare Unmarked
Lot of 3 Old Antique Half Gallon Fruit Jars Mason 1858 Atlas and Rare Unmarked
$14.99
Time Remaining: 6d 6h 8m
Buy It Now for only: $19.99

Vintage One Quart Atlas Mason Approved Patd Canning Jar Wavy Glass Blue
Vintage One Quart Atlas Mason Approved Patd Canning Jar Wavy Glass Blue
$9.95
Time Remaining: 6d 6h 47m
Buy It Now for only: $12.95

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