Every Professor Birch's Observations card we price, most valuable first. Prices are what copies actually sold for, updated daily.
What a Professor Birch's Observations card is worth
The most valuable Professor Birch's Observations on this list is Professor Birch's Observations (159 Full Art) from XY - Primal Clash at $19.75£14.63€17.53, and the 2 priced copies across 1 sets are worth $20£15€18 together. Most of that sits in a handful of printings: the older the set and the scarcer the print run, the wider the gap to the rest.
The highest PSA 10 on record for Professor Birch's Observations sold for $131.02£97.05€116.29. reverse holo printings are priced separately from the standard card, because they do not trade at the same money.
If you are trying to identify which Professor Birch's Observations you have, the set name is printed on the card and the collector number sits in the bottom corner. Open the card here and the page carries every printing of it, the graded prices, and whether grading the copy is worth the fee. Sets to start with: XY - Primal Clash.