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

Masons Patent Quart Jar no number hand blown  with Atlas Zinc Lid
Masons Patent Quart Jar no number hand blown with Atlas Zinc Lid
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Atlas Mason Jar
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Vintage Atlas Strong Shoulder Quart Mason Jar Light Green Tint Embossed
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Vintage Mason Atlas Ideal Ball jars wire seal with lids Various sizes
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Antique Atlas Mason Patent  Quart Jar Beautiful bubbles
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Atlas E Z Seal Mason Jar glass lid 1 Qt soft shoulder style
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Time Remaining: 6d 8h 57m

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2 ANTIQUE Ball ATLAS E Z SEAL MASON CANNING JARS Plus 2 Extra Jars
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ATLAS MASON IMPROVED PATD APPLE GREEN PINT FRUIT CANNING JAR Excellent Cond
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Time Remaining: 13d 6h 1m
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Time Remaining: 14d 9h 29m
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Time Remaining: 15d 11h 8m
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1 quart antique atlas masons patent mason jar
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Time Remaining: 17d 21h 7m
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RARE Antique Light Olive Green ATLAS Strong Shoulder Mason Quart Jar
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$46.99
Time Remaining: 17d 23h 25m
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Time Remaining: 17d 23h 25m
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Lot 108 Antique Vintage Canning Fruit Jars Atlas Mason Ball Kerrs Lightning +
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Time Remaining: 18d 11h 42m
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Antique Atlas Masons Patent Nov 30th 1858 Cornflower Blue Half Gallon Jar
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Time Remaining: 19d 2h 34m
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Time Remaining: 19d 10h 28m
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Time Remaining: 20d 3h 30m
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Time Remaining: 21d 1h 52m
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Time Remaining: 21d 14h 40m
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Atlas Strong Shoulder PINT Mason Jar with Glass seal
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Time Remaining: 23d 2h 56m
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Time Remaining: 23d 10h 58m
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Time Remaining: 24d 5h 34m
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Time Remaining: 24d 5h 58m
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Time Remaining: 24d 11h 7m
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rare fruit jar atlas mason patent Nov 30th 1858 SKYBLUE
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Time Remaining: 25d 23h 22m
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