Professeur Chen #88, 1st Edition, French Base Set
French edition
- Card number: #88/102
- ·Finish: Non-Holo
A PSA 10 Professeur Chen #88 1st Edition from French Base Set has a TCGBerg fair value of $280 as of Nov 14, 2026. It rests on 11 recorded sales, the latest on Aug 1, 2026. PSA has graded 79 copies at PSA 10. Sales evidence is limited, so treat this value as a rough estimate.
TCGBerg Algorithm (estimated from recorded sales).
11 sales · latest Aug 1, 2026
- Population · PSA 10
- 79
- Market cap
- $22.1K
- Volatility
- 2.1%
- YTD
- ↑ 162.1%
- Sales evidence
- Limited
TCGBerg fair value · PSA 10
$280
Based on 11 recorded sales. Latest sale: Aug 1, 2026.
Price history
Weekly fair value over time, plus a confidence band around it: how precisely we can pin the value, which tightens as more sales confirm it. Dots mark individual sales, snapped to their week: red when above fair value (a premium), green when below (a deal), hollow when flagged as an outlier. Switch the active grade with the selector above.Weekly fair value for PSA 10. Shaded area is the confidence band: how precisely we can pin the value; it tightens as more sales confirm it. Dots are individual sales. Confidence band: how precisely we can pin the fair value. It widens when sales scatter and narrows as more sales back the value up. The dots show the actual sale prices.
What the evidence says
The last PSA 10 sale, $206 on Aug 1, 2026, sits 26.3% below the $280 fair value. The value rests on 11 recorded PSA 10 sales. Its confidence band runs from $244 to $315. A PSA 10 ($280) is worth 2.8 times a PSA 9 ($101). Over the past 30 days the PSA 10 value has risen 8.2%. With limited sales evidence, read the gap and the band as rough guides.
TCGBerg fair value by grade
Side-by-side comparison of value across every grade and ungraded condition we track for this printing. The bar chart uses a log scale so raw and gem-mint fit on one axis. Solid bars are the TCGBerg fair value, modelled from recorded sales. Hatched bars are the latest market price instead, shown for ungraded conditions that trade too rarely for us to price one honestly.Value at each grade and ungraded condition. Log scale. Tap a row to switch the whole page.
Behind the scenes
How the published fair value for this grade was produced: the sales it rests on, how they were put together, and every recorded change afterwards. It describes one saved calculation, not a live recomputation.What goes into this price, and how much we know.
Recent sales
9 trackedEach sale against the grade's fair value on the day it sold.
| Date | Grade | Venue | Price | vs fair value |
|---|---|---|---|---|
| Aug 11, 2026 | PSA7 | eBay | $16 | below fair value by -12.2% |
| Aug 1, 2026 | PSA10 | eBay | $206 | above fair value by +0.1% |
| May 7, 2026 | PSA10 | eBay | $234 | above fair value by +16.8% |
| Apr 13, 2026 | PSA8 | eBay | $27 | below fair value by -18.3% |
| Apr 13, 2026 | PSA10 | eBay | $217 | above fair value by +17.2% |
- $16Aug 11, 2026 · via eBayPSA7↓below fair value by 12.2%
- $206Aug 1, 2026 · via eBayPSA10↑above fair value by 0.1%
- $234May 7, 2026 · via eBayPSA10↑above fair value by 16.8%
- $27Apr 13, 2026 · via eBayPSA8↓below fair value by 18.3%
- $217Apr 13, 2026 · via eBayPSA10↑above fair value by 17.2%
| Mar 6, 2026 | PSA10 | eBay | $175 | above fair value by +10.3% |
| Mar 4, 2026 | PSA9 | eBay | $81 | above fair value by +3.2% |
| Feb 14, 2026 | PSA10 | eBay | $177 | above fair value by +23.2% |
- $175PSA10↑above fair value by 10.3%
- $81PSA9↑above fair value by 3.2%
- $177PSA10↑above fair value by 23.2%
4 more sales with Pro
Up to 20 recent sales, each with its venue and its gap to fair value.
↓Includes a sale 18.6% below fair value
All grades matrix
Every grade we track for this printing. Click any column header to sort; the rightmost column jumps you to listings for that grade.
- PSA10$2801d ↓0.4%7d ↓0.3%30d ↑8.2%
- Pop
- 79
- Mcap
- $22.1K
- Evidence
- Limited
- Last
- $206
- PSA9$1011d ·0.0%7d ↓0.3%30d ↓7.8%
- Pop
- 45
- Mcap
- $4.5K
- Evidence
- Limited
- Last
- $81
- PSA8$371d ↑0.1%7d ·0.0%30d ↑5.1%
- Pop
- 13
- Mcap
- $486
- Evidence
- Sparse
- Last
- $27
| PSA10 | $280 | 79 | $22.1K | ↓down 0.4% | ↓down 0.3% | ↑up 8.2% | ↑up 30.3% | Limited | $2064mo ago |
| PSA9 | $101 | 45 | $4.5K | 0.0% | ↓down 0.3% | ↓down 7.8% | ↑up 21.6% | Limited | $819mo ago |
| PSA8 | $37 | 13 | $486 | ↑up 0.1% | 0.0% | ↑up 5.1% | ↑up 22.7% | Sparse | $277mo ago |
| PSA7 | $24 | 2 | $47 | 0.0% | 0.0% | ↓down 3.0% | ↑up 30.1% | Sparse | $163mo ago |
| PSA6 | $21 | 2 | $41 | 0.0% | 0.0% | ↓down 4.5% | ↑up 13.3% | Sparse | - |
| PSA5 | $20 | 1 | - | 0.0% | 0.0% | ↓down 4.7% | ↑up 13.8% | Sparse | - |
PSA population report
How Professeur Chen's graded copies are spread across grades. Each bar is the number of copies graded at that grade; the percentage is that grade's share of the total graded population. These are recorded graded copies, not the total print run. A smaller population alone does not establish a price premium.142 graded copies of Professeur Chen 1st Edition across 6 grades. The selected grade is highlighted.
PSA 10 makes up 56% of graded copies: 79 of 142. It’s the most common grade for this card.
Analysis
Professeur Chen - 1st Edition at PSA 10 carries a TCGBerg fair value of $280 as of 2026-11-14. We track a TCGBerg fair value across 6 grades from French Base Set, from PSA 5 up to PSA 10. A graded population of 79 copies sits behind the PSA 10 grade. The PSA 10 valuation rests on limited sales evidence. Over the past 30 days, the PSA 10 TCGBerg fair value has risen 8.2%.