SMR Price Guide is a useless tool
1914 CJ #82 Cravath PSA 3 is listed at $200 but ALL 9 cards have sold since 2015 and ranged from $478 to $2,304
The best way to get accurate numbers are the actual auction prices realized on PSA Website
Cardtarget is useful to locate past sales of PSA, SGC, BVG and BCG cards
Looking through past auctions (REA, HA, LOTG, Goldin etc...) on the individual sites will also be a good guide to give you a better idea of price ranges
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