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

SUPER Antique Atlas Mason Olive Green Glass Canning Jar Quart Old Zinc Lid
SUPER Antique Atlas Mason Olive Green Glass Canning Jar Quart Old Zinc Lid
$48.99
Time Remaining: 10h 54m
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BLUE GLASS ATLAS QUART CANNING MASON JAR
BLUE GLASS ATLAS QUART CANNING MASON JAR
$6.00 (1 Bid)
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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
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Lot of 2 Vintage ATLAS E Z SEAL Clear Mason Jar w Glass Lids Clean
Lot of 2 Vintage ATLAS E Z SEAL Clear Mason Jar w Glass Lids Clean
$7.96
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Vintage Antique Marked Hazel Atlas Mason Jar Clear Glass With Glass Lid And Wire
Vintage Antique Marked Hazel Atlas Mason Jar Clear Glass With Glass Lid And Wire
$4.99
Time Remaining: 1d 10h 2m

Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$19.99
Time Remaining: 2d 10h 12m
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Light Ball Blue  ATLAS MASONS PATENT Fruit Jar
Light Ball Blue ATLAS MASONS PATENT Fruit Jar
$5.00
Time Remaining: 2d 11h 29m

Steely Blue  ATLAS MASONS PATENT Fruit Jar
Steely Blue ATLAS MASONS PATENT Fruit Jar
$5.00
Time Remaining: 2d 11h 38m

Sky Blue  ATLAS MASONS PATENT Fruit Jar
Sky Blue ATLAS MASONS PATENT Fruit Jar
$5.00
Time Remaining: 2d 11h 43m

Vintage Hazel Atlas Glass lot strong shoulder canning decanter jug Mason jar
Vintage Hazel Atlas Glass lot strong shoulder canning decanter jug Mason jar
$39.95
Time Remaining: 2d 13h 49m

Strong Olive Green Atlas Mason Improved Patd Canning Fruit Jar
Strong Olive Green Atlas Mason Improved Patd Canning Fruit Jar
$46.45 (21 Bids)
Time Remaining: 2d 14h 56m

Vintage Atlas Mason Improved Patd Green Quart Jar worig green insert lid
Vintage Atlas Mason Improved Patd Green Quart Jar worig green insert lid
$12.95
Time Remaining: 2d 18h 20m
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Vintage Blue Quart Atlas Strong shoulder Mason Jar
Vintage Blue Quart Atlas Strong shoulder Mason Jar
$0.99
Time Remaining: 2d 18h 35m

VINTAGE ATLAS STRONG SHOULDER MASON JAR NICE
VINTAGE ATLAS STRONG SHOULDER MASON JAR NICE
$17.00
Time Remaining: 2d 18h 35m

VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
$35.95
Time Remaining: 3d 11h 50m
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Antique 1800s Atlas Mason Improved Patd Glass Jar Bottle Unique 28
Antique 1800s Atlas Mason Improved Patd Glass Jar Bottle Unique 28
$8.99
Time Remaining: 3d 14h 40m
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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
$25.00
Time Remaining: 3d 14h 52m
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GLASS ATLAS EZ SEAL QUART CANNING FRUIT MASON JAR OLD ANTIQUE
GLASS ATLAS EZ SEAL QUART CANNING FRUIT MASON JAR OLD ANTIQUE
$5.00
Time Remaining: 3d 19h 33m
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ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$7.99
Time Remaining: 3d 20h

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: 4d 12h 58m
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Antique Atlas Masons Quart Canning Jar
Antique Atlas Masons Quart Canning Jar
$6.95
Time Remaining: 5d 7h 44m

ATLAS STRONG SHOULDER MASON FRUIT JAR QUART ZINC LID
ATLAS STRONG SHOULDER MASON FRUIT JAR QUART ZINC LID
$5.00
Time Remaining: 5d 15h 33m

Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
Time Remaining: 5d 18h 20m
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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 20h 21m
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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: 6d 19h 58m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$12.00
Time Remaining: 8d 6h
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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
$3.99
Time Remaining: 8d 16h 38m
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Atlas Strong Shoulder 1 Pint Mason Canning Vtg Jar Whittled Bubbles Aqua Glass
Atlas Strong Shoulder 1 Pint Mason Canning Vtg Jar Whittled Bubbles Aqua Glass
$19.00
Time Remaining: 10d 17h 53m
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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: 10d 19h 19m
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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: 11d 12h 21m
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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: 12d 10h 27m
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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: 13d 13h 21m
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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 16h 44m
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Antique Vtg ATLAS E Z SEAL Mason JAR Metal Bail Clear Glass Lid Lot A1
Antique Vtg ATLAS E Z SEAL Mason JAR Metal Bail Clear Glass Lid Lot A1
$15.00
Time Remaining: 15d 12h 37m
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6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
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Time Remaining: 15d 14h 48m
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2 Old Aqua Mason Jars Porcelain Lined Zinc Lids 1 is Atlas Strong Shoulder
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$20.00
Time Remaining: 15d 16h 2m
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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: 15d 19h 57m
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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: 17d 11h 56m
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Antique Industrial Blue Atlas Mason Jar Reclaimed Barn Wood Lamps Steampunk Cool
Antique Industrial Blue Atlas Mason Jar Reclaimed Barn Wood Lamps Steampunk Cool
$79.00
Time Remaining: 17d 12h 19m
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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: 19d 9h
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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: 20d 13h 32m
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ATLAS STRONG SHOULDER MASON 5 1 4H  8
ATLAS STRONG SHOULDER MASON 5 1 4H 8
$8.99
Time Remaining: 22d 16h 49m
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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: 24d 19h 27m
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Antique Atlas Special Mason Shoulder Seal Quart Wide Mouth Mason Jar
Antique Atlas Special Mason Shoulder Seal Quart Wide Mouth Mason Jar
$45.99
Time Remaining: 25d 17h 56m
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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: 26d 7h 43m
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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: 26d 14h 17m
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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: 26d 19h 11m
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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: 26d 19h 19m
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PURPLE PINT ATLAS STRONG SHOULDER MASON FRUIT JAR WITH ORIGINAL ATLAS EMB LID
PURPLE PINT ATLAS STRONG SHOULDER MASON FRUIT JAR WITH ORIGINAL ATLAS EMB LID
$44.00
Time Remaining: 27d 7h
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 27d 9h 32m
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Purple Atlas Masons Patent quart jar circ 1900
Purple Atlas Masons Patent quart jar circ 1900
$65.00
Time Remaining: 28d 15h 24m
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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
$33.99
Time Remaining: 28d 19h 36m
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