It is not a rule set in stone it is just a guide to see what similar cards and grades went for.
Both short term and long term past sales both help to set what is the appreciation rate or the depreciation rate(usually going up)
Otherwise how else can anyone have an idea what the card you want might be worth or what you want to pay
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Thanks all
Jeff Kuhr
https://www.flickr.com/photos/144250058@N05/
Looking for
1920 Heading Home Ruth Cards
1917-20 Felix Mendelssohn Babe Ruth
1921 Frederick Foto Ruth
Joe Jackson Cards 1916 Advertising Backs
1910 Old Mills Joe Jackson
1914 Boston Garter Joe Jackson
1915 Cracker Jack Joe Jackson
1911 Pinkerton Joe Jackson
Shoeless Joe Jackson Autograph
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