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 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: 8h 10m
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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
$9.95
Time Remaining: 1d 6h 51m

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: 1d 8h 21m
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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: 1d 8h 44m
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Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
Olive Green Antique Glass ATLAS MASONS PATENT Canning Jar w zinc lid
$21.50
Time Remaining: 1d 9h 1m

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: 1d 18h 42m

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
$9.99
Time Remaining: 2d 2h 24m
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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: 2d 5h 18m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$9.99
Time Remaining: 2d 6h 46m

ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
$19.99
Time Remaining: 2d 7h 13m
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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 8h 1m

Lite Olive Green Atlas Strong Shoulder Mason Half Gallon with Atlas  lid
Lite Olive Green Atlas Strong Shoulder Mason Half Gallon with Atlas lid
$24.99
Time Remaining: 2d 8h 8m
Buy It Now for only: $40.00

Antique Mason Jar 1 2 Gal ATLAS STRONGE SHOULDER MASON 2 A great condition
Antique Mason Jar 1 2 Gal ATLAS STRONGE SHOULDER MASON 2 A great condition
$9.99
Time Remaining: 2d 22h 32m

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
$19.99
Time Remaining: 3d 9h 23m

AtlasStrong Shouldersprint Mason W Eye On Front
AtlasStrong Shouldersprint Mason W Eye On Front
$7.99
Time Remaining: 3d 9h 40m
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Vintage Blue Quart Atlas Strong shoulder Mason Jar
Vintage Blue Quart Atlas Strong shoulder Mason Jar
$3.99
Time Remaining: 3d 23h 27m

Lot of 15 Vintage ATLAS STRONG SHOULDER Mason Jars Zinc Lids 4 Blue 11 Clear
Lot of 15 Vintage ATLAS STRONG SHOULDER Mason Jars Zinc Lids 4 Blue 11 Clear
$19.99
Time Remaining: 4d 5h 45m

Vintage Antique ATLAS E Z SEAL Canning Jar Quart Aqua Blue Green Mason
Vintage Antique ATLAS E Z SEAL Canning Jar Quart Aqua Blue Green Mason
$7.88
Time Remaining: 4d 6h 35m

Boyd Mason Quart Fruit Canning Jar with Zinc Milkglass Atlas Lid Vintage
Boyd Mason Quart Fruit Canning Jar with Zinc Milkglass Atlas Lid Vintage
$14.99
Time Remaining: 4d 7h 1m

BEAUTIFUL BLUE GLASS CANNING FRUIT JAR DROPPED A ATLAS E Z SEAL OLD MASON GLASS
BEAUTIFUL BLUE GLASS CANNING FRUIT JAR DROPPED A ATLAS E Z SEAL OLD MASON GLASS
$5.88
Time Remaining: 4d 7h 48m

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: 4d 9h 26m

ATLAS MASONS PATENT 1 Quart Canning Jar + squat E Z Seal 2 blue
ATLAS MASONS PATENT 1 Quart Canning Jar + squat E Z Seal 2 blue
$19.99
Time Remaining: 4d 18h 36m

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: 4d 22h 2m
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$17.99
Time Remaining: 4d 23h 21m
Buy It Now for only: $17.99

Atlas Mason Jar Blue with nice bubbles
Atlas Mason Jar Blue with nice bubbles
$1.99
Time Remaining: 5d 2h 54m

Atlas Mason Jar Blue with Bubbles
Atlas Mason Jar Blue with Bubbles
$1.99
Time Remaining: 5d 2h 55m

1 2 PINT ATLAS MASON JAR
1 2 PINT ATLAS MASON JAR
$3.99
Time Remaining: 5d 6h 15m

Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
$8.45
Time Remaining: 5d 7h 19m

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: 5d 8h 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
$17.99
Time Remaining: 5d 8h 59m
Buy It Now for only: $23.89

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
Time Remaining: 5d 9h

VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$39.95
Time Remaining: 5d 9h 10m
Buy It Now for only: $39.95

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: 6d 3h 48m
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SQUARE ATLAS MASON on 2 SIDES OZ MARKINGS on 2 SIDES QUART JAR
SQUARE ATLAS MASON on 2 SIDES OZ MARKINGS on 2 SIDES QUART JAR
$9.99
Time Remaining: 6d 20h 25m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 8d 7h 28m
Buy It Now for only: $33.99

6 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT  DECOR
6 VINTAGE ATLAS AQUA GLASS MASON JARS W ZINC LIDS CRAFT DECOR
$49.99
Time Remaining: 8d 7h 55m
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ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
ANTIQUE QUART CANNING JAR ATLAS STRONG SHOULDER MASON
$6.00
Time Remaining: 9d 5h 4m

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: 9d 9h 7m
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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
$8.11
Time Remaining: 9d 11h 2m
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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: 13d 8h 27m
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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: 14d 1h 3m
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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: 14d 1h 29m
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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: 14d 4h 55m
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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: 14d 23h 36m
Buy It Now for only: $22.75

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
$39.95
Time Remaining: 15d 8h 32m
Buy It Now for only: $39.95

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: 18d 3h 57m
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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: 18d 9h 6m
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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: 19d 21h 21m
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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: 20d 1h 5m
Buy It Now for only: $4.99

Antique Atlas Masons Jar Apple Green VG Rare Bubble Glass
Antique Atlas Masons Jar Apple Green VG Rare Bubble Glass
$29.99
Time Remaining: 20d 3h 14m
Buy It Now for only: $29.99

Vintage 1 Quart ATLAS Masons Patent Aquamarine Jar w Zinc  Clear Glass Lid
Vintage 1 Quart ATLAS Masons Patent Aquamarine Jar w Zinc Clear Glass Lid
$5.95
Time Remaining: 21d 45m
Buy It Now for only: $5.95

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: 21d 1h 24m
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Small Atlas JUNIOR MASON fruit jarMINT
Small Atlas JUNIOR MASON fruit jarMINT
$9.95
Time Remaining: 21d 3h 46m
Buy It Now for only: $9.95

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: 21d 7h 11m
Buy It Now for only: $415.00

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: 21d 22h 9m
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: 22d 1h 17m
Buy It Now for only: $8.99

Antique blue glass Atlas Masons Patent canning jar ND2504
Antique blue glass Atlas Masons Patent canning jar ND2504
$16.00
Time Remaining: 23d 6h 58m
Buy It Now for only: $16.00

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: 24d 6h 28m
Buy It Now for only: $49.99

Masons canning jar Pat 1858 Atlas Boyds ND2506
Masons canning jar Pat 1858 Atlas Boyds ND2506
$15.00
Time Remaining: 24d 7h 32m
Buy It Now for only: $15.00

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