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

Blue Green Antique 3L Ball Mason Jar with Zinc Atlas Lid 1896 1910 Set of 2
Blue Green Antique 3L Ball Mason Jar with Zinc Atlas Lid 1896 1910 Set of 2
$34.99
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Antique Blue Green Atlas Masons Patent Quart Canning Jar with Lid
Antique Blue Green Atlas Masons Patent Quart Canning Jar with Lid
$9.00
Time Remaining: 8h 9m

MASON HALF GAL 11 30 1853 ATLAS HALFGAL WHEATON16 PRESTO  KERR QU VTG CLEAR B
MASON HALF GAL 11 30 1853 ATLAS HALFGAL WHEATON16 PRESTO KERR QU VTG CLEAR B
$99.99
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Mason Jar Atlas Jar using Masons patent
Mason Jar Atlas Jar using Masons patent
$8.99
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$10.00
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Antique Olive green Atlas Masons Patent Quart Jar w Zinc Lid Canning  M27
Antique Olive green Atlas Masons Patent Quart Jar w Zinc Lid Canning M27
$139.99
Time Remaining: 1d 5h 1m

RARE ANTIQUE GLASS THREADED SCREW COVER AND ATLAS STRONG SHOULDER MASON JAR
RARE ANTIQUE GLASS THREADED SCREW COVER AND ATLAS STRONG SHOULDER MASON JAR
$100.00
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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
$29.99
Time Remaining: 1d 7h 16m
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Yellow Green Atlas Strong Shoulder Mason fruit jar
Yellow Green Atlas Strong Shoulder Mason fruit jar
$9.99
Time Remaining: 2d 1h 57m
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Light Cornflower Blue Atlas strong shoulder Mason fruit jar
Light Cornflower Blue Atlas strong shoulder Mason fruit jar
$0.99
Time Remaining: 2d 1h 57m

Beautifully Crude  Colorful Old Sky Blue ATLAS MASONS PATENT Canning Jar
Beautifully Crude Colorful Old Sky Blue ATLAS MASONS PATENT Canning Jar
$9.95
Time Remaining: 2d 2h 35m

3 Vtg ATLAS H over A MASON Clear Glass HG Qt Pt Sq Bowtie Band CANNING FRUIT JAR
3 Vtg ATLAS H over A MASON Clear Glass HG Qt Pt Sq Bowtie Band CANNING FRUIT JAR
$24.99
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3 Vtg ATLAS H over A MASON Clear Glass HG Qt Pt Sq Bowtie Ring CANNING FRUIT JAR
3 Vtg ATLAS H over A MASON Clear Glass HG Qt Pt Sq Bowtie Ring CANNING FRUIT JAR
$24.49
Time Remaining: 2d 3h 11m
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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: 2d 6h 10m
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Atlas Mason Improved Patd Quart Aqua Fruit Jar Atlas Peened Out in Mold
Atlas Mason Improved Patd Quart Aqua Fruit Jar Atlas Peened Out in Mold
$14.99
Time Remaining: 2d 8h 59m

Aqua Green Masons Quart Canning Jar Patent Nov 30 1858 + Zinc Boyds Atlas Lid
Aqua Green Masons Quart Canning Jar Patent Nov 30 1858 + Zinc Boyds Atlas Lid
$12.99
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2 OLD ONE QT FRUIT JARS ATLAS MASONS PATENT  BALL MASON
2 OLD ONE QT FRUIT JARS ATLAS MASONS PATENT BALL MASON
$15.00
Time Remaining: 3d 20h 31m

Atlas EZ Seal Mason Jar Green Glass 48 oz 15 Quarts Neat Air Bubbles Wire Bail
Atlas EZ Seal Mason Jar Green Glass 48 oz 15 Quarts Neat Air Bubbles Wire Bail
$70.00
Time Remaining: 3d 21h 31m
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Atlas Strong Shoulder  Ball 4 w Presto Glass Lid Mason Canning Jars Green Tint
Atlas Strong Shoulder Ball 4 w Presto Glass Lid Mason Canning Jars Green Tint
$14.99
Time Remaining: 4d 46m

MASON PATENT NOV 30 1858 MALTESE CROSS JAR WITH ATLAS CAP
MASON PATENT NOV 30 1858 MALTESE CROSS JAR WITH ATLAS CAP
$12.00
Time Remaining: 4d 5h 56m

6 pieces Vintage Blue Fruit Jars Atlas Ball Perfect Mason ROOT tin
6 pieces Vintage Blue Fruit Jars Atlas Ball Perfect Mason ROOT tin
$0.99
Time Remaining: 4d 8h 7m

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
$24.99
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VINTAGE ANTIQUE ATLAS MASON PATENT QUART AQUA BLUE GLASS CANNING JAR
VINTAGE ANTIQUE ATLAS MASON PATENT QUART AQUA BLUE GLASS CANNING JAR
$7.99
Time Remaining: 4d 17h 35m

Old Original Atlas Masons Patent Pint Fruit Canning Jar Aqua Blue
Old Original Atlas Masons Patent Pint Fruit Canning Jar Aqua Blue
$8.50
Time Remaining: 5d 7h 8m

ATLAS STRONG SHOULDER MASON pint Lt blue
ATLAS STRONG SHOULDER MASON pint Lt blue
$14.76
Time Remaining: 5d 11h 52m
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Vintage Light Blue Atlas Masons Patent Quart Jar
Vintage Light Blue Atlas Masons Patent Quart Jar
$3.49
Time Remaining: 6d 5h 22m
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Vintage Antique Aqua Blue Pint Canning Jar Bottle Atlas Mason Strong Shoulder
Vintage Antique Aqua Blue Pint Canning Jar Bottle Atlas Mason Strong Shoulder
$17.55
Time Remaining: 6d 13h 53m
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Rare Fruit Jar Citron Emb Atlas Strong Shoulder Mason 1 2 Galsize
Rare Fruit Jar Citron Emb Atlas Strong Shoulder Mason 1 2 Galsize
$99.99
Time Remaining: 7d 5h 46m
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Vintage Clear Glass Mason Jar Lid Atlas Lot 12
Vintage Clear Glass Mason Jar Lid Atlas Lot 12
$9.99
Time Remaining: 7d 23h 13m
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Antique Atlas Unamarked Mason Purple Amethyst Quart Canning Jar w Lid
Antique Atlas Unamarked Mason Purple Amethyst Quart Canning Jar w Lid
$24.99
Time Remaining: 8d 3h 58m
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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: 8d 7h 35m
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ATLAS Special Mason Wide Mouth Canning Jar
ATLAS Special Mason Wide Mouth Canning Jar
$44.28
Time Remaining: 8d 9h 18m
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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: 9d 37m
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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
$24.38
Time Remaining: 9d 22h 44m
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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: 11d 1h 38m
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Atlas Strong Shoulder Round Clear Glass Pint Mason Jar 12 4     P17
Atlas Strong Shoulder Round Clear Glass Pint Mason Jar 12 4 P17
$2.99
Time Remaining: 11d 23h 55m
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Atlas Masons patent canning jars 2 qt 1 qt
Atlas Masons patent canning jars 2 qt 1 qt
$20.00
Time Remaining: 12d 18h 17m
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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
$127.20
Time Remaining: 13d 3h 5m
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3 Atlas Strong Shouder Mason Jars Old
3 Atlas Strong Shouder Mason Jars Old
$16.99
Time Remaining: 13d 6h 18m
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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: 13d 8h 13m
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Antique  Vintage Lot Atlas Masons Patent Telephone Whitney Glass Canning Jars
Antique Vintage Lot Atlas Masons Patent Telephone Whitney Glass Canning Jars
$59.99
Time Remaining: 13d 19h 47m
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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 1h 46m
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Antique Glass Jar  Atlas Masons Patent 1 Quart Circa 1920s
Antique Glass Jar Atlas Masons Patent 1 Quart Circa 1920s
$6.39
Time Remaining: 15d 26m
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Antique blue glass Atlas Masons Patent 1 quart canning jar ND2504
Antique blue glass Atlas Masons Patent 1 quart canning jar ND2504
$10.50
Time Remaining: 16d 15h 32m
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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: 16d 21h 17m
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Sky Blue Atlas Strong Shoulder Mason Half Gallon Jar
Sky Blue Atlas Strong Shoulder Mason Half Gallon Jar
$22.00
Time Remaining: 19d 6h 1m
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Atlas Strong Shoulder Mason Canning Jar Mason Quart Blue with Zinc Lid
Atlas Strong Shoulder Mason Canning Jar Mason Quart Blue with Zinc Lid
$29.99
Time Remaining: 19d 6h 52m
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Atlas Strong Shoulder Mason Canning Jar Mason Half Gallon Blue with Zinc Lid
Atlas Strong Shoulder Mason Canning Jar Mason Half Gallon Blue with Zinc Lid
$34.99
Time Remaining: 19d 6h 52m
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ATLAS MASONS PATENT OLIVE AMBER SWIRLED QUART MASON JAR ANTIQUE RARE
ATLAS MASONS PATENT OLIVE AMBER SWIRLED QUART MASON JAR ANTIQUE RARE
$535.00
Time Remaining: 22d 7h 44m
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Sky Blue ATLAS MASONS JAR Patent Nov 30th 1858 Half Gallon Fruit Jar
Sky Blue ATLAS MASONS JAR Patent Nov 30th 1858 Half Gallon Fruit Jar
$19.95
Time Remaining: 23d 8m
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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: 24d 2h 33m
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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
$19.99
Time Remaining: 24d 4h 38m
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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
$18.00
Time Remaining: 24d 8h 45m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 24d 21h 48m
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OLD VTG ATLAS IMPROVED MASON AQUA GLASS CANNING JAR HERO CROSS WITH LID PAT 1867
OLD VTG ATLAS IMPROVED MASON AQUA GLASS CANNING JAR HERO CROSS WITH LID PAT 1867
$34.87
Time Remaining: 26d 5h 18m
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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
$14.99
Time Remaining: 26d 5h 38m
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BLUE TINTED GLASS MASONS JAR PATENT NOV 301858 with ATLAS Lid 9 H
BLUE TINTED GLASS MASONS JAR PATENT NOV 301858 with ATLAS Lid 9 H
$9.95
Time Remaining: 26d 9h 21m
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Atlas Wire Bale  Glass Lid Quart Mason Jar Clear Glass Round No Lid K50
Atlas Wire Bale Glass Lid Quart Mason Jar Clear Glass Round No Lid K50
$2.99
Time Remaining: 26d 21h 22m
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Atlas E Z Seal Wire Bale  Glass Lid Quart Mason Jar Clear Glass Round K53
Atlas E Z Seal Wire Bale Glass Lid Quart Mason Jar Clear Glass Round K53
$4.99
Time Remaining: 26d 21h 26m
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