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 FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$35.95
Time Remaining: 7h 9m
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Vintage ATLAS Strong Shoulder Mason 1 2 Half Gallon Blue Green Jar Zinc Lid
Vintage ATLAS Strong Shoulder Mason 1 2 Half Gallon Blue Green Jar Zinc Lid
$9.99
Time Remaining: 15h 16m

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: 15h 26m

DARK PURPLE ATLAS MASONS PATENT PINT FRUIT JAR W A ZINC LID
DARK PURPLE ATLAS MASONS PATENT PINT FRUIT JAR W A ZINC LID
$33.99 (4 Bids)
Time Remaining: 15h 47m

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: 18h 20m

the good one 1 2 gallaon Atlas Special Mason fruit jar aqua
the good one 1 2 gallaon Atlas Special Mason fruit jar aqua
$40.00
Time Remaining: 20h 16m

Atlas Strong Shoulder PINT Mason Jar with Glass seal
Atlas Strong Shoulder PINT Mason Jar with Glass seal
$17.90
Time Remaining: 1d 9h 5m
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Vintage Blue Glass PINT Size ATLAS Strong Shoulder Mason Canning Jar w Zinc Lid
Vintage Blue Glass PINT Size ATLAS Strong Shoulder Mason Canning Jar w Zinc Lid
$4.50
Time Remaining: 1d 10h 24m

1900 HAZEL ATLAS BOYDS MASON FARIS BOTTLE AND ALUMINUM THERMOS ZINC TOP OLD
1900 HAZEL ATLAS BOYDS MASON FARIS BOTTLE AND ALUMINUM THERMOS ZINC TOP OLD
$99.99
Time Remaining: 1d 12h 9m
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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: 1d 12h 49m

rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
$24.95
Time Remaining: 1d 14h 10m

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: 1d 18h 11m

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: 1d 19h 48m

Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
$21.62
Time Remaining: 1d 19h 53m

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
$6.99
Time Remaining: 2d 12h 11m

vintage atlas ez seal mason jar quart size with glass top
vintage atlas ez seal mason jar quart size with glass top
$5.99
Time Remaining: 2d 15h 48m
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Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 2d 16h 53m

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: 2d 19h 15m
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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
$99.99
Time Remaining: 2d 20h 5m

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: 3d 9h 34m

atlas masons patent green
atlas masons patent green
$9.99
Time Remaining: 3d 13h 20m

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: 3d 18h 43m

vintage atlas wholefruit mason jar quart size with glass top
vintage atlas wholefruit mason jar quart size with glass top
$5.99
Time Remaining: 3d 18h 46m
Buy It Now for only: $5.99

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
$9.95
Time Remaining: 3d 19h 47m

Atlas Masons blue canning jars 2 qt 1 qt 1 pt zinc lid
Atlas Masons blue canning jars 2 qt 1 qt 1 pt zinc lid
$20.00
Time Remaining: 4d 6h 13m

Fruit Jar Atlas Mason Improved
Fruit Jar Atlas Mason Improved
$9.99
Time Remaining: 4d 10h 36m

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: 4d 14h 59m

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
$15.00
Time Remaining: 4d 15h 55m
Buy It Now for only: $24.00

Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
$28.00
Time Remaining: 4d 16h 1m
Buy It Now for only: $38.00

HAZEL ATLAS GOOD LUCK FOUR LEAF CLOVER GRAPHIC QUART CANNING FRUIT JAR OLD MASON
HAZEL ATLAS GOOD LUCK FOUR LEAF CLOVER GRAPHIC QUART CANNING FRUIT JAR OLD MASON
$4.95 (1 Bid)
Time Remaining: 4d 17h 12m

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: 4d 18h 48m

TOUGH TO FIND ATLAS SPECIAL MASON FRUIT JAR WITH ORIGINAL LID NEAR PERFECT
TOUGH TO FIND ATLAS SPECIAL MASON FRUIT JAR WITH ORIGINAL LID NEAR PERFECT
$0.99 (1 Bid)
Time Remaining: 4d 19h 53m

AWESOME REWORKED MOLD WITH EXCELLENT GHOSTING ATLAS MASON PLUS ORIGINAL DESIGN
AWESOME REWORKED MOLD WITH EXCELLENT GHOSTING ATLAS MASON PLUS ORIGINAL DESIGN
$0.99
Time Remaining: 4d 19h 55m

Atlas Arched Masons Special QuartGreenish Aqua Stamp Lid Opague Insert
Atlas Arched Masons Special QuartGreenish Aqua Stamp Lid Opague Insert
$14.99
Time Remaining: 4d 20h 56m

Vintage Mason Atlas Ideal Ball jars wire seal with lids Various sizes
Vintage Mason Atlas Ideal Ball jars wire seal with lids Various sizes
$14.00
Time Remaining: 4d 21h 43m
Buy It Now for only: $22.00

EARLY ATLAS MASON BLUE JAR w FLOWER FROG
EARLY ATLAS MASON BLUE JAR w FLOWER FROG
$12.75
Time Remaining: 5d 8h 13m
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2antique canning jars BALL perfect MASON atlas Qt Blue Green Zinc Lid Quart
2antique canning jars BALL perfect MASON atlas Qt Blue Green Zinc Lid Quart
$14.99
Time Remaining: 5d 15h 43m
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hazel atlas  samco genuine mason jar square pint with rubber seal lid antique
hazel atlas samco genuine mason jar square pint with rubber seal lid antique
$9.99
Time Remaining: 5d 15h 56m
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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: 5d 17h 43m
Buy It Now for only: $19.99

Antique Atlas Strong Shoulder Mason Blue Pint Fruit or Canning Jar No Bars
Antique Atlas Strong Shoulder Mason Blue Pint Fruit or Canning Jar No Bars
$19.99
Time Remaining: 5d 22h 42m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 6d 11h 12m
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Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
$15.95
Time Remaining: 6d 16h 1m

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: 6d 16h 46m

VTG SMALL HALF PINT BALL PERFECT MASON ATLAS CANNING FRUIT JAR OLD ANTIQUE GLASS
VTG SMALL HALF PINT BALL PERFECT MASON ATLAS CANNING FRUIT JAR OLD ANTIQUE GLASS
$14.95
Time Remaining: 8d 19h 4m
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$19.99
Time Remaining: 11d 11h 52m
Buy It Now for only: $19.99

ANTIQUE ATLAS MASONS PATENT PINT JAR SKY BLUE
ANTIQUE ATLAS MASONS PATENT PINT JAR SKY BLUE
$20.00
Time Remaining: 12d 13h 4m
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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: 12d 15h 35m
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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: 12d 15h 35m
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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: 12d 15h 45m
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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: 12d 16h 19m
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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: 12d 16h 20m
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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: 14d 18h 31m
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 14d 19h 59m
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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: 15d 11h 43m
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Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great Cond
Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great Cond
$27.49
Time Remaining: 15d 21h 38m
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1800s Atlas Strong Shoulder Mason Embossed Glass Jar Bottle 29
1800s Atlas Strong Shoulder Mason Embossed Glass Jar Bottle 29
$14.99
Time Remaining: 17d 16h 22m
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RARE Vintage Light Green ATLAS Masons Patent Quart Jar With Atlas Zinc Lid
RARE Vintage Light Green ATLAS Masons Patent Quart Jar With Atlas Zinc Lid
$46.99
Time Remaining: 18d 9h 55m
Buy It Now for only: $46.99

HAZEL ATLAS SPECIAL MASON SQUARE QUART JAR
HAZEL ATLAS SPECIAL MASON SQUARE QUART JAR
$10.00
Time Remaining: 19d 8h 36m
Buy It Now for only: $10.00

Rare fruit jar atlas mason improved PatD 1 2 gal See
Rare fruit jar atlas mason improved PatD 1 2 gal See
$99.99
Time Remaining: 19d 20h 58m
Buy It Now for only: $99.99

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