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 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
$6.95
Time Remaining: 10h 24m

Atlas Strong Shoulder PINT Mason Jar with Glass seal
Atlas Strong Shoulder PINT Mason Jar with Glass seal
$16.47
Time Remaining: 14h 44m
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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
$99.99
Time Remaining: 16h 22m
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ANTIQUE ATLAS MASONS JAR PAT NOV 30 1858 9 TALL AQUA BLUE W ZINC LID
ANTIQUE ATLAS MASONS JAR PAT NOV 30 1858 9 TALL AQUA BLUE W ZINC LID
$12.99
Time Remaining: 1d 11h 39m

AQUA BLUE ATLAS E Z SEAL SQUATTY PINT FRUIT Mason JAR WIRE SIDE W LID
AQUA BLUE ATLAS E Z SEAL SQUATTY PINT FRUIT Mason JAR WIRE SIDE W LID
$9.99
Time Remaining: 1d 12h 43m

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
$8.00
Time Remaining: 1d 16h 24m

Antique Atlas 1 QT Strong Shoulder Mason Light Green w Atlas Zinc Lid
Antique Atlas 1 QT Strong Shoulder Mason Light Green w Atlas Zinc Lid
$6.00
Time Remaining: 1d 18h 53m

vintage atlas ez seal mason jar quart size with glass top
vintage atlas ez seal mason jar quart size with glass top
$5.99
Time Remaining: 1d 20h 1m
Buy It Now for only: $5.99

Fruit Jar Atlas Mason Improved
Fruit Jar Atlas Mason Improved
$9.99
Time Remaining: 1d 21h 25m

BLUE GREEN ATLAS E Z SEAL DROPPED A SMALL PINT JAR OLD MASON WIRE BAIL GLASS LID
BLUE GREEN ATLAS E Z SEAL DROPPED A SMALL PINT JAR OLD MASON WIRE BAIL GLASS LID
$6.95
Time Remaining: 1d 23h 20m

LIGHT GREEN SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
LIGHT GREEN SQUAT PINT ARCHED ATLAS EZ SEAL OLD ANTIQUE FRUIT CANNING MASON JAR
$8.95
Time Remaining: 1d 23h 57m

HALF GALLON ATLAS EZ SEAL DROPPED A E Z JAR OLD VINTAGE MASON WIRE BAIL GLASS HG
HALF GALLON ATLAS EZ SEAL DROPPED A E Z JAR OLD VINTAGE MASON WIRE BAIL GLASS HG
$6.95
Time Remaining: 2d 42m

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
$4.95
Time Remaining: 2d 42m

GREEN BLUE AQUA ATLAS E Z SEAL CANNING FRUIT JAR OLD ANTIQUE WIRE BAIL MASON EZ
GREEN BLUE AQUA ATLAS E Z SEAL CANNING FRUIT JAR OLD ANTIQUE WIRE BAIL MASON EZ
$5.55 (1 Bid)
Time Remaining: 2d 42m

rare amethyst atlas masons patnov301858 2 quart canning jar
rare amethyst atlas masons patnov301858 2 quart canning jar
$119.99
Time Remaining: 2d 1h 34m

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: 2d 1h 50m
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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: 2d 15h 25m

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
$0.99
Time Remaining: 2d 17h 12m

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
$75.00
Time Remaining: 2d 19h 37m

vintage atlas wholefruit mason jar quart size with glass top
vintage atlas wholefruit mason jar quart size with glass top
$5.99
Time Remaining: 2d 22h 58m
Buy It Now for only: $5.99

Atlas Mason Improved Patd Crude
Atlas Mason Improved Patd Crude
$2.99
Time Remaining: 2d 23h 52m

J 89 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lid 4 E
J 89 Vintage ATLAS E Z SEAL Clear Mason Jar Pint Size w Glass Lid 4 E
$12.99
Time Remaining: 3d 16m

Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
$14.00
Time Remaining: 3d 35m
Buy It Now for only: $24.00

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
$38.99
Time Remaining: 3d 13h 29m

Vintage Blue ATLAS Strong Shoulder Mason 1 2 Half Gallon Jar Zinc Lid
Vintage Blue ATLAS Strong Shoulder Mason 1 2 Half Gallon Jar Zinc Lid
$8.99 (1 Bid)
Time Remaining: 3d 15h 36m

Vintage 1920s ATLAS E Z Seal Pint Size Mason Jar Wire Bail  Glass Lid Seal
Vintage 1920s ATLAS E Z Seal Pint Size Mason Jar Wire Bail Glass Lid Seal
$4.99
Time Remaining: 3d 15h 36m

Vintage ATLAS H Over A MASON Canning Fruit Jar Quart Clear Gray Zinc ATLAS Lid
Vintage ATLAS H Over A MASON Canning Fruit Jar Quart Clear Gray Zinc ATLAS Lid
$5.99
Time Remaining: 3d 15h 42m

Atlas Strong Shoulder Mason Light Cornflower Blue
Atlas Strong Shoulder Mason Light Cornflower Blue
$3.99
Time Remaining: 3d 19h 33m

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: 3d 23h 39m

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: 3d 23h 42m

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: 3d 23h 46m

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: 3d 23h 48m

Masons Patent 1858 Aqua Quart Canning Jar  Atlas Lid
Masons Patent 1858 Aqua Quart Canning Jar Atlas Lid
$4.00
Time Remaining: 4d 15h 56m

LK HAZEL ATLAS MASON HALF GALLON CANNING JAR ATLAS PORCELAIN ZINC LID
LK HAZEL ATLAS MASON HALF GALLON CANNING JAR ATLAS PORCELAIN ZINC LID
$13.99
Time Remaining: 4d 17h 32m

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
$8.99
Time Remaining: 4d 20h 9m
Buy It Now for only: $8.99

ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$8.50
Time Remaining: 4d 20h 42m

LOT OF 4 VINTAGE MASON JARSATLAS EZ SEALBALL IDEALDREYBALL PERFECT MASON
LOT OF 4 VINTAGE MASON JARSATLAS EZ SEALBALL IDEALDREYBALL PERFECT MASON
$9.95
Time Remaining: 4d 22h 27m

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
$7.95
Time Remaining: 4d 22h 56m

APPLE GREEN ATLAS E Z SEAL SMALL PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
APPLE GREEN ATLAS E Z SEAL SMALL PINT JAR OLD VINTAGE MASON WIRE BAIL GLASS LID
$9.95
Time Remaining: 4d 23h 7m

Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
$15.95
Time Remaining: 5d 1h 32m

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
$17.99
Time Remaining: 5d 4h 34m
Buy It Now for only: $17.99

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 5d 15h 7m

cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 5d 15h 24m
Buy It Now for only: $29.99

VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$39.95
Time Remaining: 6d 13h 45m
Buy It Now for only: $39.95

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
$18.95
Time Remaining: 7d 14h 21m
Buy It Now for only: $18.95

Atlas Mason Canning Fruit Jars Lime Green  Citron Pints Aqua Quart Zinc Lids
Atlas Mason Canning Fruit Jars Lime Green Citron Pints Aqua Quart Zinc Lids
$36.66 (3 Bids)
Time Remaining: 9d 17h 44m

Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$19.99
Time Remaining: 10d 16h 5m
Buy It Now for only: $19.99

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: 11d 20h 32m
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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: 14d 12m
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2 Atlas Strong Shoulder Mason Quart Jars W Atlas Boyds Porcelain Zinc Caps
2 Atlas Strong Shoulder Mason Quart Jars W Atlas Boyds Porcelain Zinc Caps
$19.99
Time Remaining: 14d 15h 57m
Buy It Now for only: $19.99

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: 15d 1h 51m
Buy It Now for only: $27.49

Antique blue glass Atlas Masons Patent canning jar ND2504
Antique blue glass Atlas Masons Patent canning jar ND2504
$16.00
Time Remaining: 16d 23h 36m
Buy It Now for only: $16.00

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: 19d 1h 11m
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: 19d 18h 13m
Buy It Now for only: $99.99

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: 19d 21h 39m
Buy It Now for only: $69.99

RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar 3
RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar 3
$24.99
Time Remaining: 20d 1h 38m
Buy It Now for only: $24.99

BLUE ATLAS MASON JAR FRUIT JAR FAST SHIPPING
BLUE ATLAS MASON JAR FRUIT JAR FAST SHIPPING
$21.95
Time Remaining: 20d 22h 44m
Buy It Now for only: $21.95

Vintage Atlas Mason Quart Sized Canning Jar Mint
Vintage Atlas Mason Quart Sized Canning Jar Mint
$17.95
Time Remaining: 23d 1h 41m
Buy It Now for only: $17.95

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: 23d 20h 41m
Buy It Now for only: $79.96

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