Title comps
Realized prices for the same title, issue and grade across houses — different physical copies. For one specific slab, use cert provenance.
Same book, same gradecard base koffing pokemon set #51 · grade 9Same card, set and grade across sources — different physical copies. Not the same slab. For one specific slab's history use cert provenance.
PSA and CGC grade the same number differently and their prices differ — pick a grading company; card numbers are never pooled across graders.
Jul 13, 2026Fanatics Collect1999 Pokemon Base Set Koffing #51 PSA 9 MINTedition unstated (pooled with unlimited)PSA 9$15.00
Jun 15, 2026Fanatics Collect1999 Pokemon Base Set Koffing #51 CGC 9 MINTedition unstated (pooled with unlimited)CGC 9$12.00