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Professor's Research
SWSH Black Star Promos

Professor's Research

SWSH Black Star Promos · SWSH178/307
Illustration: Yusuke Kozaki →
Market value · English · Near Mint
£1.17
mostly £1 – £2 ·

What is Professor's Research SWSH178/307 (SWSH Black Star Promos) worth?

As of 2026-10-24: In Near Mint, an English copy of Professor's Research SWSH178/307 is worth about £1.17, based on 71 real sales.

  1. 1
    Real sales

    71 completed Near Mint sales from eBay, Goldin and Fanatics, each one checked on the listing page.

  2. 2
    Outliers out

    Prices far above or below the median are dropped: lots, fakes, mismatched cards.

  3. 3
    Recent counts more

    Newer sales weigh more than old ones, so the value follows the market, not the yearly average.

No estimate, no asking prices. Paid sales only.
Origin: Pokémon GO 5th anniversary and Pokémon TCG 25th anniversary / Pokémon GO V Battle Deck—Mewtwo vs. Melmetal · Product insert · Pokémon GO
Promo Pokémon Center · SWSH178 £6.18
Market price
£1.17
based on 71 sales
Price history · RAW
2026-01-11 · £0.60 £14.72 · 2026-10-20
Cross-market · RAW median per marketplace
Spread vs. cheapest market — before shipping/duty/fees
ebay.co.uk n=11 £2.80 +96%
ebay.es n=3 £2.46 +72%
ebay.it n=7 £1.90 +33%
ebay.com n=98 £1.43 —
Price per print
🇬🇧 Normal · EN n=105 £1.17
How is this value calculated?
Ladder estimate · English · ~£1.17 gruen
Evidence pathSalesAgeValue vᵢWeight gᵢ
eigene rohe NM-Verkäufe68 11 d £1.17555.1
eigene LP-Verkäufe ÷ 0.874212 17 d £0.844.02
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.17 · Σ g = 559.12

Measured error for this era×language (backtest): ±17 %

Ladder estimate · Deutsch · ~£1.29 gruen
Evidence pathSalesAgeValue vᵢWeight gᵢ
en roh NM × 1.0999 (Sprach-Faktor aus 152 Karten)68 11 d £1.291.18
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.29 · Σ g = 1.18

Measured error for this era×language (backtest): ±22 %

Ladder estimate · Français · ~£1.31 gelb
Evidence pathSalesAgeValue vᵢWeight gᵢ
en roh NM × 1.1187 (Sprach-Faktor aus 76 Karten)68 11 d £1.313.26
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.31 · Σ g = 3.26

Measured error for this era×language (backtest): ±20 %

Gate not green — shown only here, never as the price.

Ladder estimate · Italiano · ~£1.36 gruen
Evidence pathSalesAgeValue vᵢWeight gᵢ
en roh NM × 1.1593 (Sprach-Faktor aus 151 Karten)68 11 d £1.364.0
value = exp( Σ gᵢ·ln vᵢ ⁄ Σ gᵢ ) = £1.36 · Σ g = 4.0

Measured error for this era×language (backtest): ±18 %

PSA Population EN Σ 125
PSA 10
56 45%
PSA 9
34 27%
PSA 8
15 12%
PSA ≤7
20 16%
PSA · Pokemon Go Pokemon Center Campaign · as of 2026-10-20
Recent sales · 121
2026-10-20 EN RAW NM Professor's Research SWSH178 Pokémon GO Black Star Promo Hol · eBay £1.68
2026-10-19 EN RAW NM PROFESSOR'S RESEARCH SWSH178 HOLO SWORD & SHIELD PROMO POKEM · eBay £0.93
2026-10-17 EN RAW NM Professor's Research (Pokemon Go Code) SWSH178 Sword & Shiel · eBay £0.75
2026-10-17 EN RAW NM PROFESSOR'S RESEARCH (POKEMON GO CODE) SWSH178 SWORD & SHIEL · eBay £1.57
2026-10-17 EN RAW NM Pokemon Professor's Research SWSH178 Holo Promo Sword & Shie · eBay £0.75
2026-10-15 EN RAW UNKNOWN PROFESSOR'S RESEARCH-POKEMON GO TCG-BLACK STAR PROMO-SWSH178 · eBay £5.32
2026-10-15 EN RAW NM Professor's Research [Professor Willow] Holo Promo SWSH178 N · eBay £0.74
2026-10-11 EN RAW NM Professor's Research Holo Promo SWSH: Sword & Shield Promo C · eBay £1.34
2026-10-11 EN RAW NM Professor's Research (SWSH178) [Sword & Shield: Black Star P · eBay £3.60
2026-10-11 EN RAW LP Professor's Research - SWSH178 - SWSH Black Star Promos (Lp) · eBay £0.74
2026-10-10 EN RAW NM Professor's Research SWSH178 Holo Sword & Shield Promo Pokem · eBay £1.31
2026-10-07 EN RAW UNKNOWN Pokémon Go One Professor’s Research Professor Willow Promo H · eBay £2.21
2026-10-05 EN RAW NM Pokémon TCG Professor's Research-Promo Card SWSH178- Pokémon · eBay £1.20
2026-10-04 EN RAW LP Professor's Research [Professor Willow] (with Pokemon Go Cod · eBay £0.72
2026-10-04 EN RAW NM Professor's Research Pokemon Go Code SWSH178 Sword & Shield · eBay £0.74
2026-10-04 EN RAW NM Professor's Research SWSH178 Promo Pokemon Card NM · eBay £2.60
2026-10-01 EN RAW MP Professor's Research SWSH178 Holo Promo Sword & Shield Promo · eBay £2.81
2026-10-01 EN RAW NM Professor's Research SWSH178 SWSH: Sword & Shield Promo Card · eBay £1.48
2026-09-30 EN RAW NM 1X Professor's Research SWSH178 Pokémon GO Promo Holo NM Mul · eBay £0.73
2026-09-29 EN RAW NM Pokémon SWSH178 Professor's Research (Willow) | Promo + Code £3.68
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FAQ

Frequently asked questions

Auction or Buy It Now — which gets more for Professor's Research SWSH Black Star Promos SWSH178/307?

Across 13 auctions the median was £0.93, across 102 fixed-price sales £1.45. Fixed price therefore fetched about 56 % more — for this card patience with a set price is the better route.

What will I get for Professor's Research SWSH Black Star Promos SWSH178/307 if I want to sell quickly?

Half of all sales fell between £1.27 and £2.43, with a median of £1.45. 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 SWSH Black Star Promos SWSH178/307 unrealistic?

The cheapest genuine sales were around £0.73. Offers well below £0.44 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.