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

Ultra rare and early atlas special edition wide mouth mason jar green blue
Ultra rare and early atlas special edition wide mouth mason jar green blue
$39.99
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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 (1 Bid)
Time Remaining: 11h 54m

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 (2 Bids)
Time Remaining: 11h 54m

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: 13h 3m
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RARE Vintage Light Green ATLAS Masons Patent Quart Jar With Atlas Zinc Lid
RARE Vintage Light Green ATLAS Masons Patent Quart Jar With Atlas Zinc Lid
$9.99
Time Remaining: 20h 45m

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: 1d 1h 25m

Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$19.99
Time Remaining: 1d 4h
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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
$4.99
Time Remaining: 1d 6h 25m

Atlas Strong Shoulder Mason Light Cornflower Blue
Atlas Strong Shoulder Mason Light Cornflower Blue
$3.99
Time Remaining: 1d 9h 25m

Atlas Masons Patent Fruit Jar W Zinc Lid Collectible Antique Bottle
Atlas Masons Patent Fruit Jar W Zinc Lid Collectible Antique Bottle
$10.00
Time Remaining: 2d 3h 49m

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: 2d 8h 28m
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ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$8.50
Time Remaining: 2d 8h 37m

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: 2d 10h 16m

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: 2d 10h 53m

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
$8.95
Time Remaining: 2d 11h 3m

1 quart antique atlas masons patent mason jar
1 quart antique atlas masons patent mason jar
$10.99
Time Remaining: 2d 12h 45m

Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
Vintage Blue Quart Atlas Strong shoulder Mason Jar with Lid
$15.95
Time Remaining: 2d 13h 29m

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 3d 3h 3m

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: 3d 5h 53m

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
$14.95
Time Remaining: 3d 8h 8m

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: 3d 19h 14m

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: 4d 6h 34m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
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VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$44.95
Time Remaining: 5d 58m
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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: 5d 7h 30m

Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
$21.62
Time Remaining: 5d 7h 45m

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: 5d 13h 46m
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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: 5d 18h 24m
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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
$9.99
Time Remaining: 5d 23h 40m

BLUE GREEN ATLAS E Z SEAL Quart JAR OLD MASON WIRE BAIL GLASS LID
BLUE GREEN ATLAS E Z SEAL Quart JAR OLD MASON WIRE BAIL GLASS LID
$1.99
Time Remaining: 6d 1h 39m

Patent 1858 Atlas Mason Jar with OG Lid
Patent 1858 Atlas Mason Jar with OG Lid
$6.99
Time Remaining: 6d 5h 32m
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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
$24.99
Time Remaining: 6d 10h 52m

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: 6d 10h 52m

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: 6d 11h

ATLAS MASONS PATENT FRUIT JAR BUBBLES ZINC PORCELAIN LID RARE ANTIQUE BIM EMB
ATLAS MASONS PATENT FRUIT JAR BUBBLES ZINC PORCELAIN LID RARE ANTIQUE BIM EMB
$9.95
Time Remaining: 6d 11h 10m

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: 6d 12h 55m

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
$4.45
Time Remaining: 6d 12h 55m

Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
Atlas Masons Patent Nov 30 1858 2 liter zinc top marked ATLAS
$0.99
Time Remaining: 6d 21h 17m
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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: 7d 11h 31m
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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: 9d 13h 7m
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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: 10d 6h 9m
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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: 10d 9h 35m
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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
$24.99
Time Remaining: 10d 13h 34m
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Vintage Atlas Mason Quart Sized Canning Jar Mint
Vintage Atlas Mason Quart Sized Canning Jar Mint
$17.95
Time Remaining: 13d 13h 37m
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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
$99.95
Time Remaining: 14d 8h 37m
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Masons canning jar Pat 1858 Atlas Boyds ND2506
Masons canning jar Pat 1858 Atlas Boyds ND2506
$25.00
Time Remaining: 14d 9h 29m
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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: 14d 11h 34m
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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: 14d 13h 45m
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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: 16d 2h
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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
$5.99
Time Remaining: 16d 5h 44m
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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: 16d 7h 53m
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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
$149.99
Time Remaining: 18d 2h 49m
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Atlas Masons Patent Fruit Jar
Atlas Masons Patent Fruit Jar
$9.99
Time Remaining: 18d 4h 47m
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vintage atlas wholefruit mason jar pint size with glass top
vintage atlas wholefruit mason jar pint size with glass top
$5.99
Time Remaining: 19d 11h 11m
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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
$83.99
Time Remaining: 21d 4h 18m
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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: 22d 7h 56m
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vintage atlas wholefruit mason jar quart size with glass top
vintage atlas wholefruit mason jar quart size with glass top
$5.99
Time Remaining: 23d 10h 54m
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VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
VERY RARE FRUIT JAR PRICE VALUES BOOK BALL MASON ATLAS 2000 GLASS JARS W DESCRI
$44.95
Time Remaining: 25d 5h 5m
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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
$9.99
Time Remaining: 25d 8h 5m
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