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

Beautiful Squat Pint Bell Shaped ATLAS E Z SEAL Mason Jar
Beautiful Squat Pint Bell Shaped ATLAS E Z SEAL Mason Jar
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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 Antique Aqua Blue Pint Canning Jar Bottle Atlas Mason Strong Shoulder
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Atlas Mason Jar Patented 1858 Item B
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Blue Atlas Strong Shoulder Mason Fruit Canning Jar 2 Qt
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 SMALL MOUTH Multi PC TIN LID FOR  ATLAS JUNIOR MASON JAR
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Atlas Strong Shoulder Round Clear Glass Pint Mason Jar 12 4     P17
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Antique Large Masons Patent Nov 30th 1885 Fruit Canning Jar Atlas Ball
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Vintage Antique Atlas Masons Patent Aqua Green Blue Pint Jar with Zinc Lid 16 oz
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Antique Atlas Strong Shoulder Mason Jar Green Gray Color
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VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
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ATLAS MASONS PATENT LIGHT APPLE GREEN JAR HALF GALLON HG
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Antique Mason Jar Atlas Strong Shoulder Bubbles in Glass Ceramic insert in lid
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Atlas Mason Improved Patd Crude
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Vintage Canning Jars Atlas Ball Mason Zinc Covers 3 Pcs
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Uncommon  ATTRACTIVE Olive Green ATLAS EZ SEAL Mason Canning Jar
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Vtg BuBBled ATLAS MASONS PATENT blue aqua Quart Fruit Jar w Zinc Lid Great Cond
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Atlas Masons Patent Nov 30th 1858 half gallon light cornflower blue jar RARE
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Antique Atlas Masons Jar Green
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Antique Atlas Strong Shoulder Mason Blue Pint Fruit or Canning Jar No Bars
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Rare Fruit Jar Citron Emb Atlas Strong Shoulder Mason 1 2 Galsize
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Rare fruit jar atlas mason improved PatD 1 2 gal See
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RareSky Blue fruit jar emb atlas mason improved PatD 1 2 gal See
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Atlas E Z Seal Mason Jar glass lid 1 Qt soft shoulder style
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Antique Glass ATLAS MASONS PATENT Canning Jar W Zinc Lid  Bubbles Nice
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Rare Citron Green Atlas Mason Jar Embossed Patd Antique Bubble Excellent Pint
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6 pc Bluish Drey Clear Atlas Strong Shoulder Mason Kerr Half Gallon Fruit Jars
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Vintage styrofoam handled thermos with atlas mason glass inside 8 cup capacity
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hazel atlas  samco genuine mason jar square pint with rubber seal lid antique
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cornflower blue atlas strong shouldered mason fruit jar
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ANTIQUE VINTAGE BLUE HALF GALLON ATLAS STRONG SHOULDER MASON JAR W LID
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MASON HALF GAL 11 30 1853 ATLAS HALFGAL WHEATON16 PRESTO  KERR QU VTG CLEAR B
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Masons Patent Nov 30th 1858 1 Qt Jar Atlas Zinc Lid plus Canning Funnel
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Time Remaining: 29d 1h 7m
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Atlas Strong Shoulder Pint Size Mason Jar
Atlas Strong Shoulder Pint Size Mason Jar
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Time Remaining: 29d 3h 6m
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