What is graded manga?

Graded manga is a professionally inspected, sealed, and rated manga volume, slabbed in a tamper-evident acrylic case by Beckett (BGS). The grading company assigns a numeric grade from 1.0 to 10.0 based on the book's condition (corners, spine, page quality, surface, and overall preservation), authenticates the print run, and seals the book inside a protective holder forever. Graded slabs are the standard for serious manga collectors because the grade is independently verified and the book is protected from any further wear.

Is graded manga worth more than raw manga?

For key issues and high-grade copies, yes, sometimes by 5 to 10 times. A Japanese One Piece Vol. 1 1st print in BGS 9.4 can trade for multiples of the raw equivalent, because the grade certifies the condition is genuinely top-tier (not just "looks new"). For mid-series volumes, common condition tiers, or books worth under about $100 raw, grading costs more than it adds. The rule of thumb: grading is worth it when (a) the book is a key issue, and (b) a half-grade swing changes the market price by $100 or more. See our breakdown at why grade your manga.

Who grades manga right now?

BGS (Beckett Grading Services) is the only third-party grader actively running an at-scale manga grading program today. CGC is the long-established standard for American comics, and CBCS is the smaller of the legacy comic graders, but for manga specifically the entire serious collector market trades in BGS slabs. That is where the buyer pool, the population data, and the price discovery all sit. If you are buying or submitting in 2026, BGS is the practical answer.

Where can I see real graded manga prices?

West Blue runs a live manga price tracker that aggregates BGS-graded manga sold prices from eBay, PWCC, and major auction houses. You can filter by series, volume, and grade to see what a specific slab is actually trading for today rather than guessing from list prices. Updated daily.

How do I buy authentic graded manga online?

Stick to verified collectibles sellers that disclose the cert number, show the BGS label clearly in the photos, and ship in protective packaging. Every graded manga listing at West Blue Collectibles includes the slab cert number so you can verify it directly on Beckett's lookup. Avoid "graded" listings from unbranded marketplace sellers where the case looks generic or the cert number isn't shown, because counterfeit slabs do exist, especially for high-value One Piece, Naruto, and Demon Slayer keys. If you're new to graded manga, start with our graded manga primer.

鑑定済み英語版マンガ

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鑑定済み英語版マンガの販売。英語版の初版を BGS（Beckett）のホルダーに封入した鑑定品です。このコレクションのすべての英語版マンガは、状態の鑑定を受け、開封痕の残るケースに封入され、永久的な鑑定番号が与えられています。英語版のキーアイテムを集めるなら、ここが証明付きのカタログです。

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鑑定済み英語版マンガが過小評価されてきた理由と、その急速な変化

鑑定済みマンガの市場は長らく日本語版の初版に集中し、英語版は相対的に安く据え置かれてきました。その差は急速に縮まりつつあります。『遊☆戯☆王』の英語版初版、反転していないオリジナルの Viz 版『ドラゴンボール』、初期 Tokyopop 版『美少女戦士セーラームーン』、Dark Horse 版『ベルセルク』の初期巻は、いまや本格的な投資対象の収集品です。英語版マンガは棚に並べるより読み捨てられてきたため、高グレードの残存率は日本語版よりはるかに低く、BGS 9.4 以上の英語版は本当に希少です。市場が成熟するにつれ、キーアイテムでは日本語版との価格差が縮まっています。

英語版スラブの価値を決めるもの

要素は3つです。刷り数（初版には明確な上乗せがつきます。当店ではスラブを出品する前に必ず奥付の刷り数表示を確認します）、グレードの段階（BGS 9.0 以上が実際に投資対象となる範囲です）、そして作品です。英語版の鑑定品で最も強いのは、アニメ化された主要作品の初版第1巻です。英語版の実際の落札価格は、漫画相場トラッカーでご確認ください。

鑑定番号の照会と真贋

West Blue の英語版鑑定品の商品ページには、BGS の鑑定番号が写真に写っており、鑑定会社の照会ツールでお客様ご自身が独立して確認できます。独自ブランドのスラブは扱いません。

鑑定済み日本語版マンガのカタログや、未鑑定の英語版初版もあわせてご覧ください。予備知識には鑑定済みマンガとはをどうぞ。鑑定済み英語版マンガのご注文はすべて米国より発送し、50ドル以上で送料無料です。

Graded manga, frequently asked questions

What is graded manga?

Graded manga is a professionally inspected, sealed, and rated manga volume, slabbed in a tamper-evident acrylic case by Beckett (BGS). The grading company assigns a numeric grade from 1.0 to 10.0 based on the book's condition (corners, spine, page quality, surface, and overall preservation), authenticates the print run, and seals the book inside a protective holder forever. Graded slabs are the standard for serious manga collectors because the grade is independently verified and the book is protected from any further wear.
Is graded manga worth more than raw manga?

For key issues and high-grade copies, yes, sometimes by 5 to 10 times. A Japanese One Piece Vol. 1 1st print in BGS 9.4 can trade for multiples of the raw equivalent, because the grade certifies the condition is genuinely top-tier (not just "looks new"). For mid-series volumes, common condition tiers, or books worth under about $100 raw, grading costs more than it adds. The rule of thumb: grading is worth it when (a) the book is a key issue, and (b) a half-grade swing changes the market price by $100 or more. See our breakdown at why grade your manga.
Who grades manga right now?

BGS (Beckett Grading Services) is the only third-party grader actively running an at-scale manga grading program today. CGC is the long-established standard for American comics, and CBCS is the smaller of the legacy comic graders, but for manga specifically the entire serious collector market trades in BGS slabs. That is where the buyer pool, the population data, and the price discovery all sit. If you are buying or submitting in 2026, BGS is the practical answer.
Where can I see real graded manga prices?

West Blue runs a live manga price tracker that aggregates BGS-graded manga sold prices from eBay, PWCC, and major auction houses. You can filter by series, volume, and grade to see what a specific slab is actually trading for today rather than guessing from list prices. Updated daily.
How do I buy authentic graded manga online?

Stick to verified collectibles sellers that disclose the cert number, show the BGS label clearly in the photos, and ship in protective packaging. Every graded manga listing at West Blue Collectibles includes the slab cert number so you can verify it directly on Beckett's lookup. Avoid "graded" listings from unbranded marketplace sellers where the case looks generic or the cert number isn't shown, because counterfeit slabs do exist, especially for high-value One Piece, Naruto, and Demon Slayer keys. If you're new to graded manga, start with our graded manga primer.