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

Antique Atlas Masons Jar Apple Green VG Rare Bubble Glass
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Vintage Mason Atlas Ideal Ball jars wire seal with lids Various sizes
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rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
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ATLAS e z seal necked mason jar pint size with wire  glass top
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Vintage Atlas Strong Shoulder Mason Jar With Lid
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ATLAS MASONS PATENT FRUIT JAR BUBBLES ZINC PORCELAIN LID RARE ANTIQUE BIM EMB
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Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars Zinc Lids
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LOT of 4 Vintage ATLAS EZ SEAL Blue Aqua Mason Jars w Glass Lids Pint Size
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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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Vintage ATLAS EZ SEAL Blue Aqua Mason Jar Pint Size w Glass Lid Excellent Clean
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VINTAGE GREEN CITRON ATLAS STRONG SHOULDER MASON CANNING QUART JAR ZINC LID EXCL
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VINTAGE GREEN CITRON ATLAS PATENT MASON CANNING QUART JAR ZINC LID EXCL
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Time Remaining: 1d 13h 23m

VINTAGE GREEN CITRON ATLAS STRONG SHOULDER MASON CANNING PINT JAR ZINC LID
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Time Remaining: 1d 13h 25m

VINTAGE AQUA BLUE ATLAS STRONG SHOULDER MASON CANNING PINT JAR ZINC LID
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VINTAGE CORNFLOWER BLUE ATLAS STRONG SHOULDER MASON CANNING PINT JAR ZINC LID
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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
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ANTIQUE ATLAS MASONS PATENT PINT JAR BLUE GREEN SWIRLS
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Time Remaining: 2d 1h 1m

LIGHT GREEN 2 QT ATLAS MASONS PATENT NOV 30TH1858 FRUIT JAR W A ZINC LID
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Vintage Atlas Strong Shoulder Quart Mason Jar Light Green Tint Embossed
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ATLAS MASON Quart 1910s Mint Mason jar
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VINTAGE CORNFLOWER BLUE HAZEL ATLAS E Z SEAL MASON CANNING QUART JAR
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12 Vintage Clear Ball Perfect Mason Presto Atlas Half Gallon Canning Fruit Jars
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LARGE ATLAS STRONG SHOULDER LIGHT GREEN AMBER COLORED MASON JAR
LARGE ATLAS STRONG SHOULDER LIGHT GREEN AMBER COLORED MASON JAR
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Time Remaining: 3d 5h 34m

Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
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Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
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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
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2 ANTIQUE Ball ATLAS E Z SEAL MASON CANNING JARS Plus 2 Extra Jars
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ATLAS MASONS PATENT QUART FRUIT JAR PURPLE TINT ZINK PORCELAIN LINED LID
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Time Remaining: 4d 12h 51m

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ATLAS SPECIAL MASON SQUAT ROUND QUART FRUIT JAR AQUA ZINK PORCELAIN LINED LID
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Time Remaining: 4d 12h 51m

1 QT AQUA ATLAS STRONG SHOULDER MASON JAR WITH BOYDS ATLAS ZINC LID
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Masons Patent Quart Jar no number hand blown  with Atlas Zinc Lid
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Time Remaining: 5d 14h 52m
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Time Remaining: 6d 28m

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Atlas Mason Jar
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Time Remaining: 6d 11h 5m

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Atlas Masons patent blue mason jar
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Time Remaining: 6d 12h 59m
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Atlas Masons blue canning jars 2 qt 1 qt 1 pt zinc lid
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Nice Half Gallon Atlas Strong Shoulder Mason Jar with Atlas Zinc Lid
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Time Remaining: 9d 10h 26m
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Vintage Masons Patent Nov 30th 1858 Atlas Zinc Lid Great Collectible Jar
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EARLY ATLAS MASON BLUE JAR w FLOWER FROG
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 11d 4h 48m
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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: 11d 6h 59m
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Atlas H over A AH Mason Jar Mason zinc lid 1 Pint square style
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$8.00
Time Remaining: 11d 7h 1m
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ATLAS MASON IMPROVED PATD APPLE GREEN PINT FRUIT CANNING JAR Excellent Cond
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Time Remaining: 11d 14h 46m
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vintage atlas wholefruit mason jar pint size with glass top
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Time Remaining: 14d 9h 14m
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19TH C AMERICAN PANTRY 4 BALL ATLAS MASON FRUIT JELLY QT CANNING BLUE GLASS JARS
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Time Remaining: 15d 2h 38m
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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: 16d 5h 28m
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1910 Hazel Atlas Square Clear ATLAS Special Mason Wide Mouth Quart Jar
1910 Hazel Atlas Square Clear ATLAS Special Mason Wide Mouth Quart Jar
$18.99
Time Remaining: 18d 5h 30m
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1915 Hazel Atlas ATLAS Strong Shoulder Clear Round Quart Mason Jar
1915 Hazel Atlas ATLAS Strong Shoulder Clear Round Quart Mason Jar
$17.99
Time Remaining: 18d 5h 30m
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2 Atlas Strong Shoulder Mason Quart Jars W Atlas Boyds Porcelain Zinc Caps
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Time Remaining: 18d 10h 7m
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OLD FRUIT JAR ATLAS EASY SEAL PINT WITH ORIGINAL LID MASON JAR
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$6.99
Time Remaining: 19d 12h 5m
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
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Time Remaining: 19d 13h 35m
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bubbled X mas ATLAS MASONS PATENT blue aqua Quart zinc lid Fruit Jar Great Cond
bubbled X mas ATLAS MASONS PATENT blue aqua Quart zinc lid Fruit Jar Great Cond
$22.49
Time Remaining: 20d 15h 14m
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bubbled X mas ATLAS MASONS PATENT blue aqua Quart zinc lid Fruit Jar Great Cond
bubbled X mas ATLAS MASONS PATENT blue aqua Quart zinc lid Fruit Jar Great Cond
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Time Remaining: 20d 15h 14m
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19TH C ANT 5 FARM FRUIT PRESERVES ATLAS BALL BLUE GLASS PINT MASON CANNING JARS
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$19.99
Time Remaining: 22d 15h 14m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 23d 1h 13m
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RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar
RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar
$46.99
Time Remaining: 23d 3h 31m
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