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

ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$7.99
Time Remaining: 8h 11m

VINTAGE MASONS PATENT NOV 30th 1858 HALF GALLON JAR WAVY GLASS Zinc Atlas Lid
VINTAGE MASONS PATENT NOV 30th 1858 HALF GALLON JAR WAVY GLASS Zinc Atlas Lid
$15.00
Time Remaining: 11h 20m
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QUART AQUA ATLAS MASONS PATENT  QUART MASONS PATENT
QUART AQUA ATLAS MASONS PATENT QUART MASONS PATENT
$3.99
Time Remaining: 15h 57m

rare amethyst atlas masons patnov301858 2 quart canning jar
rare amethyst atlas masons patnov301858 2 quart canning jar
$55.99
Time Remaining: 18h 47m
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ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
$6.00
Time Remaining: 19h 21m

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
$20.99
Time Remaining: 20h 13m

VINTAGE ATLAS EZ SEAL OLIVE GREEN CANNING FRUIT MASON JAR W LID Pint
VINTAGE ATLAS EZ SEAL OLIVE GREEN CANNING FRUIT MASON JAR W LID Pint
$20.99
Time Remaining: 20h 13m

1 2 PINT ATLAS MASON JAR
1 2 PINT ATLAS MASON JAR
$2.99
Time Remaining: 20h 27m
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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: 21h 34m

LIGHT PURPLE ATLAS MASONS PATENT NOV 30 1858 2 QUART FRUIT JAR W A ZINC LID
LIGHT PURPLE ATLAS MASONS PATENT NOV 30 1858 2 QUART FRUIT JAR W A ZINC LID
$19.99
Time Remaining: 2d 9h 40m

Vintage Blue Quart Atlas Strong shoulder Mason Jar
Vintage Blue Quart Atlas Strong shoulder Mason Jar
$3.99
Time Remaining: 2d 15h 7m

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 19h 42m

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: 3d 10h 54m
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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
$9.49
Time Remaining: 3d 16h 49m
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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 12h 4m
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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: 5d 14h 34m
Buy It Now for only: $69.99

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: 5d 22h 8m
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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
$19.99
Time Remaining: 6d 16h 25m
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Antique ATLAS Masons Patent Pint Jar Aqua Whittled Hand Blown with Zinc Lid
Antique ATLAS Masons Patent Pint Jar Aqua Whittled Hand Blown with Zinc Lid
$7.99
Time Remaining: 6d 16h 48m

3 Antique Atlas Mason Canning Jars 2 Atlas Strong Shoulder  6 6 7 Bubbles
3 Antique Atlas Mason Canning Jars 2 Atlas Strong Shoulder 6 6 7 Bubbles
$9.99
Time Remaining: 6d 17h 26m

Lot of 5 Vintage ATLAS KERR GOLDEN HARVEST Quart Mason Jars FREE SHIPPING
Lot of 5 Vintage ATLAS KERR GOLDEN HARVEST Quart Mason Jars FREE SHIPPING
$14.99
Time Remaining: 6d 19h 7m

Boyd Mason Quart Fruit Canning Jar with Zinc Milkglass Atlas Lid Vintage
Boyd Mason Quart Fruit Canning Jar with Zinc Milkglass Atlas Lid Vintage
$13.99
Time Remaining: 6d 19h 10m
Buy It Now for only: $19.99

ANTIQUE BLUE ATLAS STRONG SHOULDER MASON QUART FRUIT JAR ATLAS CAP
ANTIQUE BLUE ATLAS STRONG SHOULDER MASON QUART FRUIT JAR ATLAS CAP
$6.50
Time Remaining: 6d 20h 9m

Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Mason Jars
Lot of 4 Vintage ATLAS STRONG SHOULDER Quart Size Mason Jars
$9.99
Time Remaining: 6d 22h 51m

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: 7d 19h 2m
Buy It Now for only: $19.99

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: 7d 19h 2m
Buy It Now for only: $19.99

Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
Vintage Blue Atlas Strong Shoulder Mason Jar Pint Fruit Jar Light Blue
$19.95
Time Remaining: 8d 18h 15m
Buy It Now for only: $19.95

Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$17.99
Time Remaining: 9d 12h 44m
Buy It Now for only: $17.99

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: 9d 13h 45m
Buy It Now for only: $78.99

VTG BALL No 10 Clear Glass Replacement Lid Top Mason Canning Jar Atlas
VTG BALL No 10 Clear Glass Replacement Lid Top Mason Canning Jar Atlas
$5.99
Time Remaining: 9d 20h 15m
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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
$14.00
Time Remaining: 10d 10h 32m
Buy It Now for only: $14.00

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: 10d 17h 12m
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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: 11d 15h 30m
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1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 11d 20h 17m
Buy It Now for only: $10.99

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: 12d 17h 35m
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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: 12d 17h 38m
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 12d 20h 52m
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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
$26.49
Time Remaining: 13d 22h 30m
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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
$13.51
Time Remaining: 15d 4h 3m
Buy It Now for only: $13.51

Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$20.00
Time Remaining: 15d 8h 31m
Buy It Now for only: $20.00

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: 17d 21h 51m
Buy It Now for only: $99.99

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 14h 53m
Buy It Now for only: $99.99

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: 18d 15h 24m
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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: 18d 18h 19m
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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
$22.75
Time Remaining: 19d 12h 59m
Buy It Now for only: $22.75

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: 22d 17h 20m
Buy It Now for only: $79.96

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 22h 29m
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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: 24d 10h 44m
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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 14h 28m
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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 16h 37m
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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
$24.99
Time Remaining: 25d 19h 29m
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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: 26d 11h 32m
Buy It Now for only: $119.99

ATLAS STRONG SHOULDER MASON 5 1 4H  8
ATLAS STRONG SHOULDER MASON 5 1 4H 8
$8.99
Time Remaining: 26d 17h 3m
Buy It Now for only: $8.99

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: 26d 18h 37m
Buy It Now for only: $415.00

Antique blue glass Atlas Masons Patent canning jar ND2504
Antique blue glass Atlas Masons Patent canning jar ND2504
$16.00
Time Remaining: 28d 9h 56m
Buy It Now for only: $16.00

ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
$29.99
Time Remaining: 28d 22h 55m
Buy It Now for only: $29.99

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: 29d 14h 55m
Buy It Now for only: $49.99

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