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 Clear Glass Hazel Atlas H over A pint Square Canning Mason Jar Bottle
Vintage Clear Glass Hazel Atlas H over A pint Square Canning Mason Jar Bottle
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Atlas Masons patent blue mason jar
Atlas Masons patent blue mason jar
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vintage atlas wholefruit mason jar pint size with glass top
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Patent 1858 Atlas Mason Jar with OG Lid
Patent 1858 Atlas Mason Jar with OG Lid
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Mason Jar Patent Nov30 1858 made by Hero Fruit Jar Co light aqua has Atlas lid
Mason Jar Patent Nov30 1858 made by Hero Fruit Jar Co light aqua has Atlas lid
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vintage atlas wholefruit mason jar quart size with glass top
vintage atlas wholefruit mason jar quart size with glass top
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Time Remaining: 4d 16h 38m

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rare amethyst atlas masons patnov301858 2 quart canning jar
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ANTIQUE FRUIT JAR HALF GALLON ATLAS MASON 1858 ZINC LID
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hazel atlas  samco genuine mason jar square pint with rubber seal lid antique
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Time Remaining: 20d 9h 28m
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Time Remaining: 24d 19h 19m
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Time Remaining: 25d 14h 19m
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Time Remaining: 25d 19h 27m
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Time Remaining: 26d 12h 21m
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6 VINTAGE ATLAS AQUA GLASS MASON JAR W ZINC AND GLASS LIDS CRAFT
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Time Remaining: 26d 17h 8m
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rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
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ATLAS e z seal necked mason jar pint size with wire glass top
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Time Remaining: 27d 11h 26m
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Time Remaining: 27d 13h 36m
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12 Vintage Clear Ball Perfect Mason Presto Atlas Half Gallon Canning Fruit Jars
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VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
VINTAGE FRUIT JARS PRICE GUIDE COLLECTORS BOOK BALL MASON ATLAS
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Time Remaining: 29d 9h 55m
Buy It Now for only: $39.95

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