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

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: 1d 4h 16m

LIGHT PURPLE ATLAS SPECIAL MASON 2 QUART FRUIT JAR W A ZINC LID
LIGHT PURPLE ATLAS SPECIAL MASON 2 QUART FRUIT JAR W A ZINC LID
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Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
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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
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rare amethyst atlas masons patnov301858 2 quart canning jar
rare amethyst atlas masons patnov301858 2 quart canning jar
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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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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
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Vintage Blue Quart Atlas Strong shoulder Mason Jar
Vintage Blue Quart Atlas Strong shoulder Mason Jar
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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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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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VINTAGE ATLAS STRONG SHOULDER MASON JAR MOLD 6 B
VINTAGE ATLAS STRONG SHOULDER MASON JAR MOLD 6 B
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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
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Time Remaining: 3d 13h 9m

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
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1 2 PINT ATLAS MASON JAR
1 2 PINT ATLAS MASON JAR
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ATLAS STRONG SHOULDER MASON Blue Green 1 Quart Canning Jar
ATLAS STRONG SHOULDER MASON Blue Green 1 Quart Canning Jar
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ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
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VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
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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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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
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ATLAS MASONS PATENT Fruit Jar Quart OLIVE GREEN w ATLAS zinc lid RB 150
ATLAS MASONS PATENT Fruit Jar Quart OLIVE GREEN w ATLAS zinc lid RB 150
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Time Remaining: 6d 7h 28m

Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w 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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Time Remaining: 6d 12h 7m
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Vintage Mason Atlas Glass Jar Zinc Lid Presto Lids rubber rings Misc Lot 9
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Time Remaining: 6d 13h 12m
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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
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Time Remaining: 6d 14h 27m
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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
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Time Remaining: 7d 1h 5m
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Atlas Masons blue canning jars 2 qt 1 qt 1 pt zinc lid
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Time Remaining: 7d 8h 44m
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ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
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Time Remaining: 7d 11h 19m
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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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Time Remaining: 7d 11h 49m
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Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
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Time Remaining: 8d 2h 37m
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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: 9d 3h 39m
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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: 9d 3h 41m
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Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Blue Aqua Mason Jars Zinc Lids
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Rare fruit jar atlas mason improved PatD 1 2 gal See
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2 Old Aqua Mason Jars Porcelain Lined Zinc Lids 1 is Atlas Strong Shoulder
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Time Remaining: 10d 15h 7m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
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Time Remaining: 10d 15h 52m
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RareSky Blue fruit jar emb atlas mason improved PatD 1 2 gal See
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Time Remaining: 11d 6h 49m
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ANTIQUE Blue MASON Jars ATLAS BALL KEYSTONE PATENT NOV30th 1858 BLUE LOT
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Time Remaining: 11d 10h 15m
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Vintage 1 Quart ATLAS Masons Patent Aquamarine Jar w Zinc  Clear Glass Lid
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$6.95
Time Remaining: 12d 5h 16m
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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
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Time Remaining: 13d 9h 27m
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6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
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Time Remaining: 15d 9h 17m
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Vintage Mason Jars Kerr Ball Atlas Price Is Per Jar Will Break Up Lot
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$5.00
Time Remaining: 15d 14h 25m
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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 2h 41m
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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 6h 25m
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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: 17d 8h 34m
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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: 17d 17h 34m
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SUPER RARE 2 SIDED ANTIQUE MASON JAR GREEN GLASS FLYCATCHER ATLAS
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Time Remaining: 18d 12h 17m
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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
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Time Remaining: 19d 3h 29m
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5 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT  DECOR
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Time Remaining: 20d 11h 47m
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Antique blue glass Atlas Masons Patent canning jar ND2504
Antique blue glass Atlas Masons Patent canning jar ND2504
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Time Remaining: 20d 12h 2m
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Masons canning jar Pat 1858 Atlas Boyds ND2506
Masons canning jar Pat 1858 Atlas Boyds ND2506
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Time Remaining: 20d 14h 36m
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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
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Time Remaining: 23d 5h 29m
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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: 25d 3h 21m
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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 4h
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1900 HAZEL ATLAS BOYDS MASON FARIS BOTTLE AND ALUMINUM THERMOS ZINC TOP OLD
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$33.99
Time Remaining: 28d 14h 4m
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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
$24.99
Time Remaining: 29d 10h 38m
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