Professor's Research

SVP Black Star Promos · 221/225

Illustration: Hideki Ishikawa →

Professor Program $34.02 2 sales Normal $1.92 5 sales

Market price

$0.90

Price history · RAW

2026-05-18 · $0.70 $3.92 · 2026-07-13

Price per print

🇬🇧 Normal · EN n=4 $1.92

🇩🇪 Normal · DE 1 sales · too few Last sale $1.12

How is this value calculated?

Ladder estimate · English · ~$0.90 gruen

Evidence path	Sales	Age	Value vᵢ	Weight gᵢ
eigene rohe NM-Verkäufe	2	2 mo	$0.90	16.33

value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = $0.90 · Σ g = 16.33

Measured error for this era×language (backtest): ±16 %

PSA Population EN Σ 7

PSA 10

3 43%

PSA 9

3 43%

PSA 8

1 14%

PSA · Professor Program · as of 2026-10-01

Recent sales · 5

2026-07-13	EN	RAW NM	Pokémon TCG Professor's Research SVP 221 Scarlet & Violet Bl · eBay	$0.70
2026-07-10	EN	RAW UNKNOWN	Pokemon - Professor's Research (Birch) - SVP221 - SV Promo · eBay	$3.92
2026-06-16	DE	RAW UNKNOWN	Forschung des Professors Prof. Birk SVP 221 Pokémon Promo D · eBay	$1.12
2026-06-12	EN	RAW UNKNOWN	Professor's Research SVP 221 · eBay	$2.08
2026-05-18	EN	RAW NM	Professor's Research SVP 221 - Pokemon TCG Black Star Promo · eBay	$1.71

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FAQ

Frequently asked questions

How does lastsold determine the market value?

lastsold 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.