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

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
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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
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Time Remaining: 22h 35m
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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
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Pint Light Blue  ATLAS STRONG SHOULDER MASON Canning Fruit Jar
Pint Light Blue ATLAS STRONG SHOULDER MASON Canning Fruit Jar
$3.99
Time Remaining: 1d 23h 45m

Absolutely Beautiful Yellowish Light Olive Green ATLAS EZ SEAL Mason Jar
Absolutely Beautiful Yellowish Light Olive Green ATLAS EZ SEAL Mason Jar
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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
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Time Remaining: 2d 24m
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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
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Time Remaining: 2d 11h 29m

VINTAGE MASON ATLAS JAR CENTER LIDS
VINTAGE MASON ATLAS JAR CENTER LIDS
$11.00
Time Remaining: 2d 15h 12m
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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: 2d 17h 26m
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3 Vtg ATLAS H over A MASON Clear Glass HG Qt Pt Sq Bowtie Ring CANNING FRUIT JAR
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$24.99
Time Remaining: 2d 22h 37m
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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: 3d 32m
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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: 3d 3h 15m

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: 3d 15h 33m
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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: 3d 22h 35m
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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
$17.99
Time Remaining: 3d 23h 37m
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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: 4d 4h 50m
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NY Screw Top Works GeoWH New JerseyAtlas Mason Hero Glass Works Lyon
NY Screw Top Works GeoWH New JerseyAtlas Mason Hero Glass Works Lyon
$6.00
Time Remaining: 4d 15h 43m

Rare Citron Green Atlas Mason Jar Embossed Patd Antique Bubble Excellent Pint
Rare Citron Green Atlas Mason Jar Embossed Patd Antique Bubble Excellent Pint
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Time Remaining: 4d 18h 27m
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3 Atlas Strong Shouder Mason Jars Old
3 Atlas Strong Shouder Mason Jars Old
$14.99
Time Remaining: 4d 23h 49m

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: 5d 2h 26m

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: 5d 16h 44m
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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: 6d 3h
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Huge Lot ANTIQUE JAR LIDS Over 50 Mason Atlas Ball Zinc Odd RARE Ones
Huge Lot ANTIQUE JAR LIDS Over 50 Mason Atlas Ball Zinc Odd RARE Ones
$19.99
Time Remaining: 6d 16h 14m

Old Original Atlas Masons Patent Pint Fruit Canning Jar Aqua Blue
Old Original Atlas Masons Patent Pint Fruit Canning Jar Aqua Blue
$8.99
Time Remaining: 6d 16h 26m

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: 6d 19h 54m
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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: 7d 1h 3m
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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
$47.99
Time Remaining: 7d 11h 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
$15.00
Time Remaining: 8d 10h 2m
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Antique Glass Jar  Atlas Masons Patent 1 Quart Circa 1920s
Antique Glass Jar Atlas Masons Patent 1 Quart Circa 1920s
$7.99
Time Remaining: 8d 11h 15m
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9 VNTG BLUE AQUA BALL ATLAS MASON JARS 1858 QUART PINT
9 VNTG BLUE AQUA BALL ATLAS MASON JARS 1858 QUART PINT
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Time Remaining: 9d 16h 47m

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
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Time Remaining: 10d 14h 6m
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1 Atlas Masons Patent Green Quart Mason Jar
1 Atlas Masons Patent Green Quart Mason Jar
$35.00
Time Remaining: 13d 20h 12m
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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: 16d 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: 17d 18h 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: 17d 19h 22m
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 18d 14h 38m
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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: 19d 22h 27m
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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: 20d 14h 11m
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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: 20d 14h 15m
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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: 20d 14h 17m
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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
Time Remaining: 20d 18h 32m
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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: 22d 9h 33m
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Atlas Strong Shoulder Pint Size Mason Jar
Atlas Strong Shoulder Pint Size Mason Jar
$7.00
Time Remaining: 22d 17h 32m
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Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar
Antique Atlas Strong Shoulder Mason Aqua Glass Pint Fruit Jar
$15.29
Time Remaining: 23d 11h 36m
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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
$16.99
Time Remaining: 23d 11h 36m
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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: 23d 15h 18m
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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
Time Remaining: 23d 18h 5m
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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
Time Remaining: 24d 14h 6m
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Atlas Jar using Masons patent
Atlas Jar using Masons patent
$14.99
Time Remaining: 24d 17h 13m
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$10.00
Time Remaining: 24d 21h 49m
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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
Time Remaining: 24d 22h 32m
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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
$12.99
Time Remaining: 26d 15h 37m
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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: 27d 14h 20m
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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: 28d 1h 4m
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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
$13.30
Time Remaining: 28d 10h 55m
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