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

Atlas Masons Half Gallon Patent Nov30th 1858 Very Light Blue
Atlas Masons Half Gallon Patent Nov30th 1858 Very Light Blue
$9.50
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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
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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
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ATLAS MASONS PATENT GREEN AMBER SWIRLED QUART MASON FRUIT JAR
ATLAS MASONS PATENT GREEN AMBER SWIRLED QUART MASON FRUIT JAR
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Old Atlas Masons Patent Quart Green Canning Jar with Zinc Ball Lid
Old Atlas Masons Patent Quart Green Canning Jar with Zinc Ball Lid
$49.95
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Atlas Vintage Blue Glass Pint Mason Improved Jar No Lid
Atlas Vintage Blue Glass Pint Mason Improved Jar No Lid
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
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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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Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great C
Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great C
$26.49
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c1910 SCA SUN COLORED AMETHYST QT JAR ATLAS MASONS PATENT
c1910 SCA SUN COLORED AMETHYST QT JAR ATLAS MASONS PATENT
$37.49
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c1910 SUN COLORED AMETHYST 1 2 GAL JAR ATLAS MASONS PATENT NOV30th1858
c1910 SUN COLORED AMETHYST 1 2 GAL JAR ATLAS MASONS PATENT NOV30th1858
$44.99
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BLUE MASONS QUART JAR PATENT NOV 30th 1858 with ZINC ATLAS LID HAS BUBBLES
BLUE MASONS QUART JAR PATENT NOV 30th 1858 with ZINC ATLAS LID HAS BUBBLES
$9.99
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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
$9.99
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Atlas Mason 1 2 pint Canning Jar wire bail  glass top rubber seal
Atlas Mason 1 2 pint Canning Jar wire bail glass top rubber seal
$9.99
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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
$17.36
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ATLAS STRONG SHOULDER MASON ONE QUART  8 ON THE BASE
ATLAS STRONG SHOULDER MASON ONE QUART 8 ON THE BASE
$14.99
Time Remaining: 6d 7h 19m

Light Cornflower Blue Atlas strong shoulder Mason fruit jar
Light Cornflower Blue Atlas strong shoulder Mason fruit jar
$19.99
Time Remaining: 6d 11h 21m

Yellow Green Atlas Strong Shoulder Mason fruit jar
Yellow Green Atlas Strong Shoulder Mason fruit jar
$19.99
Time Remaining: 6d 11h 21m

ATLAS MASON PATENT ONE QUART AQUA TWO PIECE MOLD
ATLAS MASON PATENT ONE QUART AQUA TWO PIECE MOLD
$14.99
Time Remaining: 6d 11h 40m

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
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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
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1 2 PINT ATLAS E Z SEAL MASON JAR 3 B ON BASE
1 2 PINT ATLAS E Z SEAL MASON JAR 3 B ON BASE
$14.99
Time Remaining: 6d 21h

1 2 GAL ATLAS E Z SEAL MASON JAR 6 A B ON BASE
1 2 GAL ATLAS E Z SEAL MASON JAR 6 A B ON BASE
$14.99
Time Remaining: 6d 21h 16m

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: 7d 14h 4m
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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
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PLUGGED MOLD ERROR Quart Hazel Atlas Mason Canning Jar Missing letter L
PLUGGED MOLD ERROR Quart Hazel Atlas Mason Canning Jar Missing letter L
$9.50
Time Remaining: 8d 10h 29m

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
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Atlas Strong Shoulder Mason Pint Aqua Fruit Jar 6 on Bottom Bubbles Zinc Lid
Atlas Strong Shoulder Mason Pint Aqua Fruit Jar 6 on Bottom Bubbles Zinc Lid
$7.00
Time Remaining: 8d 13h 38m

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
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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
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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
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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
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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
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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
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Antique Glass Jar  Atlas Masons Patent 1 Quart Circa 1920s
Antique Glass Jar Atlas Masons Patent 1 Quart Circa 1920s
$7.49
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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
$15.00
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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
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Antique 1858 ATLAS Mason Canning Jar 1 2 Gallon ZINC LID ESTATE FIND
Antique 1858 ATLAS Mason Canning Jar 1 2 Gallon ZINC LID ESTATE FIND
$19.99
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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
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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
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VINTAGE ATLAS MASONS CANNING JAR BLUE 2 QUART HALF GALLON
VINTAGE ATLAS MASONS CANNING JAR BLUE 2 QUART HALF GALLON
$74.99
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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
$19.00
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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
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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
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Atlas E Z Seal Blue Quart Mason Jar 1 A D
Atlas E Z Seal Blue Quart Mason Jar 1 A D
$8.00
Time Remaining: 24d 2h 20m
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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 4h 17m
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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
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Atlas Mason Jar Patented 1858 Item B
Atlas Mason Jar Patented 1858 Item B
$7.99
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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
$19.99
Time Remaining: 25d 12h 6m
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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 3h 50m
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Atlas E Z Seal Wire Bale  Glass Lid Quart Mason Jar Clear Glass Round K51
Atlas E Z Seal Wire Bale Glass Lid Quart Mason Jar Clear Glass Round K51
$2.99
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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 3h 54m
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Atlas E Z Seal Wire Bale  Glass Lid Quart Mason Jar Clear Glass Round K52
Atlas E Z Seal Wire Bale Glass Lid Quart Mason Jar Clear Glass Round K52
$4.99
Time Remaining: 26d 3h 57m
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Atlas Strong Shoulder Pint Size Mason Jar
Atlas Strong Shoulder Pint Size Mason Jar
$7.00
Time Remaining: 26d 14h 36m
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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: 28d 5h 34m
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Masons Patent Nov 30th 1858 1 Qt Jar Atlas Zinc Lid plus Canning Funnel
Masons Patent Nov 30th 1858 1 Qt Jar Atlas Zinc Lid plus Canning Funnel
$19.99
Time Remaining: 28d 5h 43m
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Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar  Zinc Lid
Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar Zinc Lid
$17.99
Time Remaining: 28d 6h 29m
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Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar
Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar
$16.19
Time Remaining: 28d 7h 30m
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
$19.99
Time Remaining: 29d 4h 57m
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