Professor's Research
| ebay.co.uk | n=6 | $2.27 | +120% |
| ebay.fr | n=8 | $2.10 | +103% |
| ebay.es | n=11 | $1.97 | +90% |
| ebay.de | n=11 | $1.83 | +77% |
| ebay.com | n=11 | $1.04 | — |
How is this value calculated?
Recency-weighted trimmed median of 7 NM sales (RAW; outliers trimmed against the median, newer sales weigh more, dynamic half-life).
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| eigene rohe NM-Verkäufe | 7 | 2 mo | $1.23 | 57.14 |
Measured error for this era×language (backtest): ±16 %
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 0.7961 (Sprach-Faktor aus 73 Karten) | 7 | 2 mo | $0.98 | 2.86 |
Measured error for this era×language (backtest): ±19 %
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 1.1407 (Sprach-Faktor aus 59 Karten) | 7 | 2 mo | $1.41 | 2.23 |
Measured error for this era×language (backtest): ±25 %
Gate not green — shown only here, never as the price.
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 1.1617 (Sprach-Faktor aus 47 Karten) | 7 | 2 mo | $1.43 | 7.67 |
Measured error for this era×language (backtest): ±17 %
No PSA numbers for this print yet — in any language.
#080 · R
#061 · R
#076 · R
#054 · R
#038 · R
#023 · R
#142 · R
#096 · R
#043 · HR
#134 · R
#041 · HR
#122 · R
#164 · R
#124 · R
#084 · SEC
#078 · UR
#240 · UR
#150 · UR
#SWSH152
#241 · UR
#147 · RH
#222
#122 · C
#223
#SWSH178
#125 · C
#085 · U
#123 · C
#221
#087 · HR
#155 · C
#088 · HR
#190 · R
#124 · C
Frequently asked questions
What will I get for Professor's Research Scarlet & Violet 189/198 if I want to sell quickly?
Half of all sales fell between $1.47 and $2.34, with a median of $1.90. Selling fast lands you nearer the lower end; with patience, good photos and a complete title the upper end is achievable.
Below which price is an offer for Professor's Research Scarlet & Violet 189/198 unrealistic?
The cheapest genuine sales were around $1.04. Offers well below $0.62 are typically fakes, mislabelled cards or a different variant — ask for photos of all four borders and a close-up of the surface.
How does Last Sold determine the market value?
Last Sold uses only real sales — eBay plus auction houses like Goldin & Fanatics — recent sales count more (recency weighting), outliers and fakes are removed. It's not an estimate but actual sold prices, separated by condition, language and grading.