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 Blue Quart Atlas Strong shoulder Mason Jar
Vintage Blue Quart Atlas Strong shoulder Mason Jar
$5.99
Time Remaining: 11h 18m

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: 15h 48m
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ATLAS E Z SEAL QUART JAR OLD VINTAGE MASON WIRE BAIL GLASS LID LIGHT BLUE
ATLAS E Z SEAL QUART JAR OLD VINTAGE MASON WIRE BAIL GLASS LID LIGHT BLUE
$0.99
Time Remaining: 18h 58m

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
$4.45
Time Remaining: 19h 14m

HAZEL ATLAS E Z SEAL SMALL HALF PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
HAZEL ATLAS E Z SEAL SMALL HALF PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
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Time Remaining: 19h 30m

Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars
Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars
$4.99
Time Remaining: 19h 35m

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
$9.99
Time Remaining: 20h 58m

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: 21h 25m

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: 1d 5h 59m

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
$5.99
Time Remaining: 1d 7h 8m

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: 1d 7h 40m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 1d 11h 3m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$19.99
Time Remaining: 1d 16h 21m

Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
$24.99
Time Remaining: 2d 9h 24m
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ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$7.99
Time Remaining: 2d 13h 35m

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: 2d 20h 24m

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: 3d 17h 47m
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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: 3d 18h 3m

VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
$39.95
Time Remaining: 3d 18h 43m
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Mason Jar Patent Nov30 1858 made by Hero Fruit Jar Co light aqua has Atlas lid
Mason Jar Patent Nov30 1858 made by Hero Fruit Jar Co light aqua has Atlas lid
$23.99
Time Remaining: 5d 11h 18m

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 5d 15h 53m

Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
$9.95
Time Remaining: 5d 17h 44m

rare amethyst atlas masons patnov301858 2 quart canning jar
rare amethyst atlas masons patnov301858 2 quart canning jar
$67.99
Time Remaining: 5d 22h 39m
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$15.99
Time Remaining: 6d 11h 43m
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VINTAGE ATLAS EZ SEAL OLIVE GREEN CANNING FRUIT MASON JAR W LID QUART
VINTAGE ATLAS EZ SEAL OLIVE GREEN CANNING FRUIT MASON JAR W LID QUART
$14.99
Time Remaining: 6d 17h 17m
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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: 7d 16h 11m
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ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
$10.00
Time Remaining: 9d 10h 35m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 9d 19h 51m
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ATLAS MASONS PATENT Fruit Jar Quart GREEN w ATLAS zinc milk glass lid MC
ATLAS MASONS PATENT Fruit Jar Quart GREEN w ATLAS zinc milk glass lid MC
$78.99
Time Remaining: 10d 9h 22m
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Vintage Mason Atlas Glass Jar Zinc Lid Presto Lids rubber rings Misc Lot 9 pc
Vintage Mason Atlas Glass Jar Zinc Lid Presto Lids rubber rings Misc Lot 9 pc
$14.51
Time Remaining: 10d 20h 15m
Buy It Now for only: $14.51

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: 10d 21h 29m
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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: 13d 10h 41m
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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: 13d 10h 43m
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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: 13d 10h 50m
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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: 13d 10h 56m
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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: 14d 20h 50m
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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 22h 9m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 14d 22h 55m
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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: 15d 13h 52m
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ANTIQUE Blue MASON Jars ATLAS BALL KEYSTONE PATENT NOV30th 1858 BLUE LOT
ANTIQUE Blue MASON Jars ATLAS BALL KEYSTONE PATENT NOV30th 1858 BLUE LOT
$69.99
Time Remaining: 15d 17h 18m
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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
$6.95
Time Remaining: 16d 12h 19m
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RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar 3
RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar 3
$19.99
Time Remaining: 17d 16h 30m
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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: 19d 16h 20m
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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: 19d 21h 28m
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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: 21d 9h 43m
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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: 21d 13h 27m
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Antique Atlas Masons Jar Apple Green VG Rare Bubble Glass
Antique Atlas Masons Jar Apple Green VG Rare Bubble Glass
$29.99
Time Remaining: 21d 15h 36m
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VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$35.95
Time Remaining: 22d 36m
Buy It Now for only: $35.95

SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
$415.00
Time Remaining: 22d 19h 20m
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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: 23d 10h 31m
Buy It Now for only: $119.99

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: 24d 18h 49m
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Antique blue glass Atlas Masons Patent canning jar ND2504
Antique blue glass Atlas Masons Patent canning jar ND2504
$16.00
Time Remaining: 24d 19h 5m
Buy It Now for only: $16.00

Masons canning jar Pat 1858 Atlas Boyds ND2506
Masons canning jar Pat 1858 Atlas Boyds ND2506
$25.00
Time Remaining: 24d 21h 38m
Buy It Now for only: $25.00

Vintage Atlas Mason Jar Strong Shoulder with EDJ Seal Lid and Tin Screw Top
Vintage Atlas Mason Jar Strong Shoulder with EDJ Seal Lid and Tin Screw Top
$14.00
Time Remaining: 27d 12h 31m
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Antique ATLAS Strong Shoulders Aqua Blue 2 Qt MASON Jar w Ball Lid BIG Bubbles
Antique ATLAS Strong Shoulders Aqua Blue 2 Qt MASON Jar w Ball Lid BIG Bubbles
$14.95
Time Remaining: 29d 10h 24m
Buy It Now for only: $14.95

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