2 pages on this topic, grouped by what you’re trying to do.
How to tell the 1989 Upper Deck Dale Murphy #357 reverse negative error from the corrected card, why it's scarcer, and dated sales by grade for 2025–2026.
What the 1989 Upper Deck Griffey #1 sells for raw vs PSA 9 vs PSA 10 (dated sales), why low grades can beat mid grades, and the doctored-photo story.