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

1920 AQUA BLUE 8 RIBBED BALL PERFECT MASON ORIG BOYDS CAP W ATLAS LID QUART JAR
1920 AQUA BLUE 8 RIBBED BALL PERFECT MASON ORIG BOYDS CAP W ATLAS LID QUART JAR
$19.99
Time Remaining: 18h 34m
Buy It Now for only: $25.99

ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
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Time Remaining: 20h 25m
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Mason Jar Patent Nov30 1858 made by Hero Fruit Jar Co light aqua has Atlas lid
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Time Remaining: 1d 5h 10m

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
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ATLAS MASONS PATENT 1 Quart Canning JarBlue Green
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Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
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ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
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Vintage ATLAS MASON Canning Fruit Jar Squared Quart Clear Lot of 3
Vintage ATLAS MASON Canning Fruit Jar Squared Quart Clear Lot of 3
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ANTIQUE ATLAS MINI STRONG SHOULDER MASON JAR BANK ORIGINAL ZINC TOPHAZEL ATLAS
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Time Remaining: 2d 14h 45m

hazel atlas  samco genuine mason jar square pint with rubber seal lid antique
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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: 3d 15h 33m

ATLAS EZ SEAL DROPPED A E Z SMALL PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
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Time Remaining: 3d 15h 49m

HAZEL ATLAS E Z SEAL SMALL HALF PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
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Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars
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Time Remaining: 3d 16h 9m

1900 HAZEL ATLAS BOYDS MASON FARIS BOTTLE AND ALUMINUM THERMOS ZINC TOP OLD
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Antique Atlas Strong Shoulder Mason Blue Pint Fruit or Canning Jar No Bars
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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
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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: 4d 4h 15m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 4d 7h 38m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$19.99
Time Remaining: 4d 12h 56m

ATLAS IMPROVED PAT BLUE GLASS MASON JAR
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Atlas Masons Patent and Ball Mason quart jars w air bubbles no big chips
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Antique Mason Jar Atlas Strong Shoulder Bubbles in Glass Ceramic insert in lid
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Time Remaining: 6d 14h 22m
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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
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Time Remaining: 6d 14h 38m

VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
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Time Remaining: 6d 15h 18m
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Antique ATLAS Strong Shoulders Aqua Blue 2 Qt MASON Jar w Ball Lid BIG Bubbles
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Time Remaining: 8d 5h 25m
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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: 8d 14h 19m

Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
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Time Remaining: 9d 8h 18m
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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
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Time Remaining: 10d 12h 46m
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
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ATLAS MASONS PATENT Fruit Jar Quart GREEN w ATLAS zinc milk glass lid MC
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Time Remaining: 13d 5h 57m
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Vintage Mason Atlas Glass Jar Zinc Lid Presto Lids rubber rings Misc Lot 9 pc
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Time Remaining: 13d 16h 50m
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Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great Cond
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Time Remaining: 13d 18h 4m
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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
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Time Remaining: 16d 7h 16m
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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
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Time Remaining: 16d 7h 18m
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Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars Zinc Lids
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$49.99
Time Remaining: 16d 7h 24m
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Lot of 4 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lids Clean
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$29.99
Time Remaining: 16d 7h 30m
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Rare fruit jar atlas mason improved PatD 1 2 gal See
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$99.99
Time Remaining: 17d 17h 25m
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2 Old Aqua Mason Jars Porcelain Lined Zinc Lids 1 is Atlas Strong Shoulder
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$28.00
Time Remaining: 17d 18h 44m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 17d 19h 29m
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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: 18d 10h 27m
Buy It Now for only: $99.99

ANTIQUE Blue MASON Jars ATLAS BALL KEYSTONE PATENT NOV30th 1858 BLUE LOT
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$69.99
Time Remaining: 18d 13h 53m
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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: 19d 8h 53m
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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: 20d 13h 5m
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6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
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Time Remaining: 22d 12h 54m
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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: 22d 18h 3m
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rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
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Time Remaining: 24d 6h 18m
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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: 24d 10h 2m
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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: 24d 12h 11m
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VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
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$39.95
Time Remaining: 24d 21h 11m
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SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
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Time Remaining: 25d 15h 55m
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12 Vintage Clear Ball Perfect Mason Presto Atlas Half Gallon Canning Fruit Jars
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Time Remaining: 26d 7h 6m
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5 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT  DECOR
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$49.99
Time Remaining: 27d 15h 24m
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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: 27d 15h 39m
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Masons canning jar Pat 1858 Atlas Boyds ND2506
Masons canning jar Pat 1858 Atlas Boyds ND2506
$25.00
Time Remaining: 27d 18h 13m
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