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

1 2 gallon ATLAS MASON IMPROVED PATD fruit jar
1 2 gallon ATLAS MASON IMPROVED PATD fruit jar
$15.00
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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
$129.99
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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
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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
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Yellow Green Atlas Strong Shoulder Mason fruit jar
Yellow Green Atlas Strong Shoulder Mason fruit jar
$19.99
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1 QT ATLAS MASON  2 ATLAS MASONS PATENT QT JARS
1 QT ATLAS MASON 2 ATLAS MASONS PATENT QT JARS
$3.99 (1 Bid)
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RARE RARE Light Cornflower Blue half gallon Atlas Masons Patent Nov 30th 1858
RARE RARE Light Cornflower Blue half gallon Atlas Masons Patent Nov 30th 1858
$75.00
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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
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Atlas Masons 2 Qt Olive Green Canning Jar Nov 30 1858 Vtg Old A p Coffee Lid
Atlas Masons 2 Qt Olive Green Canning Jar Nov 30 1858 Vtg Old A p Coffee Lid
$44.50
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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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SCARCE  SMALL MOUTH 2 PC TIN LID FOR  ATLAS JUNIOR MASON JAR  RED BK 139
SCARCE SMALL MOUTH 2 PC TIN LID FOR ATLAS JUNIOR MASON JAR RED BK 139
$4.49
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ATLAS IMPROVED PAT BLUE GLASS MASON JAR
ATLAS IMPROVED PAT BLUE GLASS MASON JAR
$6.99
Time Remaining: 1d 14h 29m

Light Cornflower Blue Atlas strong shoulder Mason fruit jar
Light Cornflower Blue Atlas strong shoulder Mason fruit jar
$19.95
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Olive green Atlas Masons Patent fruit jar
Olive green Atlas Masons Patent fruit jar
$49.99
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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 or vintage ATLAS MASONS PATENT blue quart jar
antique or vintage ATLAS MASONS PATENT blue quart jar
$7.99
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Antique Blue Quart Atlas Masons Patent Jar with Genuine Boyd Zinc Porcelain Cap
Antique Blue Quart Atlas Masons Patent Jar with Genuine Boyd Zinc Porcelain Cap
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
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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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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
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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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Antique Mason Jars w Zinc Lids Ball Ball Atlas Glass Clear  Aqua Dug 8
Antique Mason Jars w Zinc Lids Ball Ball Atlas Glass Clear Aqua Dug 8
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Dug pretty blue ATLAS MASON IMPROVED PATD pt fruit jar antique canning
Dug pretty blue ATLAS MASON IMPROVED PATD pt fruit jar antique canning
$5.00 (1 Bid)
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ATLAS MASONS PATENT VINTAGE FRUIT JAR CANNING JAR WHITTLE MARKS WOOD M
ATLAS MASONS PATENT VINTAGE FRUIT JAR CANNING JAR WHITTLE MARKS WOOD M
$3.99
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
$33.99
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ATLAS STRONG SHOULDER MASON 5 1 4H  8
ATLAS STRONG SHOULDER MASON 5 1 4H 8
$8.99
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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
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Antique Atlas Masons Jar Green
Antique Atlas Masons Jar Green
$10.00
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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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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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Rare fruit jar atlas mason improved PatD 1 2 gal See
Rare fruit jar atlas mason improved PatD 1 2 gal See
$99.99
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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
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Green Atlas Strong Shoulder  Masons Patent Green Quart Jars
Green Atlas Strong Shoulder Masons Patent Green Quart Jars
$52.99
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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
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Antique Atlas Strong Shoulder Blown Blue Mason Jar ball Zinc Lid
Antique Atlas Strong Shoulder Blown Blue Mason Jar ball Zinc Lid
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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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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
$12.35
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vintage atlas E Z seal mason jar quart size with glass top metal sealers
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$5.99
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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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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
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Antique Glass Jar  Atlas Masons Patent 1 Quart Circa 1920s
Antique Glass Jar Atlas Masons Patent 1 Quart Circa 1920s
$14.99
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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
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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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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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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: 24d 22m
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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 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
$9.49
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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
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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
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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
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cornflower blue atlas strong shouldered mason fruit jar
cornflower blue atlas strong shouldered mason fruit jar
$29.99
Time Remaining: 28d 18h 27m
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c1900 PURPLE AMETHYST 1 2 GAL JAR ATLAS MASONS PATENT NOV30th1858
c1900 PURPLE AMETHYST 1 2 GAL JAR ATLAS MASONS PATENT NOV30th1858
$69.99
Time Remaining: 29d 1h 16m
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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: 29d 15h 21m
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