Professor's Research · Professor Program
Origin: Cosmos Holo "Professor Program" Stamped Professor Program Promos 2026 / Trainer's Toolkit 2025 · Product insert
Market price
£23.35
based on 1 sales
Price history · RAW
2026-06-14 · £22.41
£33.48 · 2026-10-18
How is this value calculated?
Ladder estimate · English
· ~£1.26
gruen
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| eigene rohe NM-Verkäufe | 6 | 19 d | £1.26 | 48.98 |
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.26 · Σ g = 48.98
Measured error for this era×language (backtest): ±16 %
Ladder estimate · Deutsch
· ~£1.05
gruen
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 0.8339 (Sprach-Faktor aus 136 Karten) | 6 | 19 d | £1.05 | 1.79 |
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.05 · Σ g = 1.79
Measured error for this era×language (backtest): ±19 %
Ladder estimate · Français
· ~£1.56
gelb
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 1.229 (Sprach-Faktor aus 59 Karten) | 6 | 19 d | £1.56 | 1.23 |
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.56 · Σ g = 1.23
Measured error for this era×language (backtest): ±25 %
Gate not green — shown only here, never as the price.
Ladder estimate · Italiano
· ~£1.44
gruen
| Evidence path | Sales | Age | Value vᵢ | Weight gᵢ |
|---|---|---|---|---|
| en roh NM × 1.1367 (Sprach-Faktor aus 47 Karten) | 6 | 19 d | £1.44 | 4.24 |
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.44 · Σ g = 4.24
Measured error for this era×language (backtest): ±17 %
PSA Population
No PSA numbers for this print yet — in any language.
Recent sales · 3
| 2026-10-18 | EN | RAW NM | Professor's Research (Birch) Professor Program #221 Promo Po · eBay | £22.41 |
| 2026-07-11 | EN | RAW UNKNOWN | Pokemon Card Professor's Research SVP221 Holo Birch Professo · eBay | £23.35 |
| 2026-06-14 | EN | RAW UNKNOWN | Professor's Research Professor Birch SVP221 Pokémon Professo · eBay | £33.48 |
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FAQ
Frequently asked questions
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.
Professor's Research · Professor Program SVP Black Star Promos · 221/225