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

GLASS ATLAS EZ SEAL QUART CANNING FRUIT MASON JAR OLD ANTIQUE
GLASS ATLAS EZ SEAL QUART CANNING FRUIT MASON JAR OLD ANTIQUE
$6.00
Time Remaining: 1h 9m
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2 ANTIQUE CORNFLOWER BLUE ATLAS STRONG SHOULDER MASON QUART FRUIT JARS 1 CAP
2 ANTIQUE CORNFLOWER BLUE ATLAS STRONG SHOULDER MASON QUART FRUIT JARS 1 CAP
$5.95
Time Remaining: 12h 51m

5 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT  DECOR
5 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT DECOR
$49.99
Time Remaining: 23h 29m
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ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$7.99
Time Remaining: 1d 47m

Lot of 2 Vintage ATLAS E Z SEAL Clear Mason Jar w Glass Lids Clean
Lot of 2 Vintage ATLAS E Z SEAL Clear Mason Jar w Glass Lids Clean
$8.95
Time Remaining: 1d 4h 28m
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BLUE GLASS ATLAS QUART CANNING MASON JAR
BLUE GLASS ATLAS QUART CANNING MASON JAR
$8.00
Time Remaining: 1d 21h 22m

ATLAS MASONS PATENT AQUA QUART MASON JAR IN GREAT CONDITION
ATLAS MASONS PATENT AQUA QUART MASON JAR IN GREAT CONDITION
$8.50
Time Remaining: 1d 22h 37m

VINTAGE ATLAS EZ SEAL LIGHT GREEN CANNING FRUIT MASON JAR W LID 1 QUART
VINTAGE ATLAS EZ SEAL LIGHT GREEN CANNING FRUIT MASON JAR W LID 1 QUART
$17.99
Time Remaining: 1d 23h 41m

Vintage Antique ATLAS E Z SEAL Canning Jar Quart Aqua Blue Green Mason
Vintage Antique ATLAS E Z SEAL Canning Jar Quart Aqua Blue Green Mason
$9.88
Time Remaining: 2d 1h 3m
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ATLAS MASONS PATENT Fruit Jar Quart GREEN w ATLAS zinc milk glass lid
ATLAS MASONS PATENT Fruit Jar Quart GREEN w ATLAS zinc milk glass lid
$4.99
Time Remaining: 2d 1h 6m

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
$49.00
Time Remaining: 2d 1h 10m
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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
$26.00
Time Remaining: 2d 12h 3m
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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: 2d 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: 3d 20h 46m
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vintage atlas E Z seal blue mason jar quart size glass top 5on bottom
vintage atlas E Z seal blue mason jar quart size glass top 5on bottom
$5.99
Time Remaining: 4d 19h 4m
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VTG 1 BLUE  1 CLEAR GLASS ATLAS E Z Seal QUART CANNING MASON JARS w lids
VTG 1 BLUE 1 CLEAR GLASS ATLAS E Z Seal QUART CANNING MASON JARS w lids
$10.00
Time Remaining: 4d 22h 27m

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 56m
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Antique Atlas Masons Quart Canning Jar
Antique Atlas Masons Quart Canning Jar
$7.95
Time Remaining: 6d 25m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 6d 26m
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1 2 PINT ATLAS MASON JAR
1 2 PINT ATLAS MASON JAR
$2.99
Time Remaining: 6d 12h 39m

All Original Pint ATTIC find with Citron ColoringATLAS STRONG SHOULDER MASON
All Original Pint ATTIC find with Citron ColoringATLAS STRONG SHOULDER MASON
$12.62 (2 Bids)
Time Remaining: 6d 16h 6m

Vintage ATLAS STRONG SHOULDER MASON CANNING JAR WITH ATLAS ZINC LID Quart
Vintage ATLAS STRONG SHOULDER MASON CANNING JAR WITH ATLAS ZINC LID Quart
$9.97
Time Remaining: 6d 18h 4m

MASON FRUIT JAR over ATLAS WHITNEY Half Gallon Aqua Canning Fruit Mason Jar
MASON FRUIT JAR over ATLAS WHITNEY Half Gallon Aqua Canning Fruit Mason Jar
$19.99
Time Remaining: 6d 18h 55m

Atlas half Gallon olive Green Mason Jar 1858
Atlas half Gallon olive Green Mason Jar 1858
$19.99
Time Remaining: 6d 20h 44m

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
$26.49
Time Remaining: 7d 2h 5m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$15.00
Time Remaining: 8d 12h 6m
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Vintage 1 Quart ATLAS Masons Patent Aquamarine Jar w Zinc  Clear Glass Lid
Vintage 1 Quart ATLAS Masons Patent Aquamarine Jar w Zinc Clear Glass Lid
$5.95
Time Remaining: 9d 19h 4m
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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: 11d 1h 25m
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RareSky Blue fruit jar emb atlas mason improved PatD 1 2 gal See
RareSky Blue fruit jar emb atlas mason improved PatD 1 2 gal See
$99.99
Time Remaining: 11d 18h 27m
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Antique Glass ATLAS MASONS PATENT Canning Jar W Zinc Lid  Bubbles Nice
Antique Glass ATLAS MASONS PATENT Canning Jar W Zinc Lid Bubbles Nice
$32.50
Time Remaining: 12d 16h 34m
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Rare Citron Green Atlas Mason Jar Embossed Patd Antique Bubble Excellent Pint
Rare Citron Green Atlas Mason Jar Embossed Patd Antique Bubble Excellent Pint
$49.99
Time Remaining: 13d 19h 28m
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2 Old Aqua Mason Jars Porcelain Lined Zinc Lids 1 is Atlas Strong Shoulder
2 Old Aqua Mason Jars Porcelain Lined Zinc Lids 1 is Atlas Strong Shoulder
$28.00
Time Remaining: 14d 19h 58m
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Antique Vtg ATLAS E Z SEAL Mason JAR Metal Bail Clear Glass Lid Lot A1
Antique Vtg ATLAS E Z SEAL Mason JAR Metal Bail Clear Glass Lid Lot A1
$15.00
Time Remaining: 15d 18h 44m
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6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
$79.96
Time Remaining: 15d 20h 55m
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A Vintage Apple Green Atlas Strong Shoulder Pint Size Mason Jar Atlas Boyd Lid
A Vintage Apple Green Atlas Strong Shoulder Pint Size Mason Jar Atlas Boyd Lid
$14.99
Time Remaining: 15d 23h 8m
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Vintage Mason Jars Kerr Ball Atlas Price Is Per Jar Will Break Up Lot
Vintage Mason Jars Kerr Ball Atlas Price Is Per Jar Will Break Up Lot
$5.00
Time Remaining: 16d 2h 3m
Buy It Now for only: $5.00

6 VINTAGE ATLAS AQUA GLASS MASON JAR W ZINC AND GLASS LIDS CRAFT
6 VINTAGE ATLAS AQUA GLASS MASON JAR W ZINC AND GLASS LIDS CRAFT
$19.99
Time Remaining: 16d 18h
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6 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT  DECOR
6 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT DECOR
$19.99
Time Remaining: 16d 18h
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rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
$99.99
Time Remaining: 17d 14h 19m
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ATLAS e z seal necked mason jar pint size with wire  glass top
ATLAS e z seal necked mason jar pint size with wire glass top
$4.99
Time Remaining: 17d 18h 2m
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Antique Industrial Blue Atlas Mason Jar Reclaimed Barn Wood Lamps Steampunk Cool
Antique Industrial Blue Atlas Mason Jar Reclaimed Barn Wood Lamps Steampunk Cool
$149.00
Time Remaining: 17d 18h 25m
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12 Vintage Clear Ball Perfect Mason Presto Atlas Half Gallon Canning Fruit Jars
12 Vintage Clear Ball Perfect Mason Presto Atlas Half Gallon Canning Fruit Jars
$119.99
Time Remaining: 19d 15h 7m
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SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
$373.50
Time Remaining: 19d 22h 13m
Buy It Now for only: $373.50

ATLAS STRONG SHOULDER MASON 5 1 4H  8
ATLAS STRONG SHOULDER MASON 5 1 4H 8
$8.99
Time Remaining: 20d 2h 53m
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LARGE BLUE ATLAS MASON JAR MASONS PATENT NOV 30TH 1858 BLUE W LID 1 2 GAL
LARGE BLUE ATLAS MASON JAR MASONS PATENT NOV 30TH 1858 BLUE W LID 1 2 GAL
$19.99
Time Remaining: 21d 1h 40m
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Antique blue glass Atlas Masons Patent 1 quart canning jar ND2504
Antique blue glass Atlas Masons Patent 1 quart canning jar ND2504
$12.00
Time Remaining: 21d 14h 56m
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ATLAS MASONS PATENT OLIVE AMBER SWIRLED QUART MASON JAR ANTIQUE RARE
ATLAS MASONS PATENT OLIVE AMBER SWIRLED QUART MASON JAR ANTIQUE RARE
$565.00
Time Remaining: 25d 1h 34m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 26d 3h 11m
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Atlas E Z Seal Mason Jar glass lid 1 Qt soft shoulder style
Atlas E Z Seal Mason Jar glass lid 1 Qt soft shoulder style
$18.00
Time Remaining: 26d 11h 42m
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Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
$19.99
Time Remaining: 26d 13h 14m
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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: 26d 20h 23m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 27d 15h 38m
Buy It Now for only: $29.99

Atlas H over A AH Mason Jar Mason zinc lid 1 Pint square style
Atlas H over A AH Mason Jar Mason zinc lid 1 Pint square style
$12.00
Time Remaining: 28d 7h 58m
Buy It Now for only: $12.00

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
$33.99
Time Remaining: 29d 1h 42m
Buy It Now for only: $33.99

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