· Written by Connor Jones, Editor
Slabbed vs Raw UK Coins: When to Get Yours Graded
A slab adds 5-15% to the realised price of a key-date UK coin — and turns "I'll sell it eventually" into "it sold last week." But it costs £25-£90 per coin in fees, takes 2-12 weeks, and only pays back above a value threshold. Here's exactly when slabbing makes sense and when it doesn't.
Last updated: 4 May 2026
The 30-second answer. Slab if the coin is worth £500+. Don't slab below £200
(fees eat the premium). Grey area £200-£500: slab for auction sales, keep raw for eBay UK.
PCGS and NGC for international value, CGS UK for UK domestic.
What slabbing actually does
- Authenticates the coin. The grading service has seen thousands of fakes — their certificate is the most credible authentication signal short of an auction-house specialist statement.
- Grades the coin. Sheldon scale 1-70 (PCGS / NGC) or CGS UK\'s 100-point scale. The grade is the single biggest determinant of value above key-date.
- Preserves the coin. Tamper-evident plastic sealed against air, dust and handling for 30+ years.
- Adds resale liquidity. Auction houses fast-track slabbed lots; eBay UK buyers trust them; international buyers won\'t bid on raw coins above £500.
What slabbing doesn\'t do
- Slabs don\'t guarantee value. A common-date 1p in PR-67 is still worth £5; slabbing won\'t change that.
- Slabs don\'t add eye-appeal. Two MS-65 coins can have visibly different strike quality; the slab grade is just one factor.
- Slabs don\'t protect against grade-shopping bias. Some buyers preferentially buy from one service over another.
- Slabs don\'t magically increase rarity. The mintage is the mintage.
When slab pays vs when it doesn\'t
| Coin value (raw) | Typical slab premium | Net after £50 fee | Verdict |
|---|---|---|---|
| £50 | +0-5% | −£47 net loss | Don\'t slab |
| £150 | +5-10% | −£35 net loss | Don\'t slab |
| £300 | +8-12% | −£20 to £0 | Marginal |
| £500 | +10-15% | +£0-£25 | Marginal-positive |
| £1,000 | +10-15% | +£50-£100 | Slab |
| £5,000+ | +10-20% | +£450+ | Always slab |
Which UK coins are most worth slabbing
- Key dates: 1933 penny, 1879 sovereign Sydney, 1879 sovereign Melbourne, 1869 Bun Head penny, 1953 Coronation crown.
- Famous rarities: 2009 Kew Gardens 50p in BU+, 2008 undated 20p mule, 1983 New Pence 2p mule.
- High-grade Victorian sovereigns: 1880-1901 in MS-63 or above.
- Royal Mint proof commemoratives: Una and the Lion, modern silver / gold proofs at PR-69+.
- Error coins: any genuine error worth £200+ — authentication is the value driver.
Coins not worth slabbing
- Common-date Elizabeth II decimal coins in BU.
- Modern circulation 50p / £1 / £2 unless rare design + high grade.
- Pre-decimal copper / bronze unless key date.
- Cheap silver Britannias bought for stacking.
- Coins you intend to keep for sentimental / album purposes.
The grading services
- PCGS — US-based, dominant globally. Best for coins you\'ll sell internationally. Highest premium.
- NGC — US-based, strong globally, especially world coins. Close second to PCGS.
- CGS UK — UK-based (Sutton, Surrey). Faster UK turnaround, no international shipping. Best for UK-domestic sales.
Avoid grading houses other than these three for UK coins — lesser-known slabs carry no premium and can actually reduce realisations vs raw.
What we recommend
- Get a realistic raw value estimate first — use MyCoinage realised data, eBay sold listings or a free auction-house estimate.
- Apply the £500 rule: below £500 stay raw; above slab.
- Choose the service: PCGS for top-tier / international, CGS UK for everything else and faster turnaround.
- Submit through a BNTA dealer if you want batch shipment and lower per-coin fees, or direct to CGS UK in Sutton.
- Don\'t resubmit borderline grades unless one tier up = £500+. Resubmission fees + risk of regrade-down rarely justify it.
Frequently asked questions
Should I slab my UK coin or keep it raw?
Slab if the coin is worth £500+, especially key dates and rare commemoratives where authentication adds 5-15% premium and slashes time-to-sale. Keep raw for coins under £200 where slab fees (£25-£90) exceed the premium added. The grey area is £200-£500: slab if you plan to sell at auction or to international buyers; keep raw if you sell on eBay UK to UK buyers who trust your photos.
What does “slabbed” actually mean?
A slab is a tamper-evident hard plastic case from a third-party grading service (PCGS, NGC or CGS UK). The service authenticates the coin (confirms it's genuine), grades it on the Sheldon scale (1-70 for PCGS/NGC, 1-100 for CGS UK), and seals it with a unique certificate number that's verifiable online. Once slabbed, the coin can't be removed without destroying the holder.
Do slabbed coins really sell for more than raw?
On average, yes — but only above a value threshold. Realised UK auction data shows slabbed key-date coins sell for 5-15% more than equivalent raw, and at significantly faster timelines. For coins below £100, the average slab premium is closer to 0% (the fee already eats the lift). For coins above £1,000, the slab can mean the difference between selling at all and not selling.
Which grading service should I use?
PCGS for international resale (US auction houses, international buyers default to PCGS). NGC is the close second, especially strong for world coins. CGS UK for UK-domestic-focused sales — UK buyers know the brand and the slab format. PCGS / NGC carry slightly stronger global premiums; CGS UK is faster turnaround domestically and accepts UK-mailed submissions without international shipping. See our comparison guide.
Can I crack out a slab to recover the raw coin?
Yes — physically you can, with care, by sawing the seam without scratching the coin. The raw coin is still valuable (you keep the underlying value); but the slab grade and certification are gone, so you lose the “slab premium.” Cracking out makes sense if (a) you got an unexpectedly low grade and want to resubmit hoping for higher, or (b) you want the coin back in a Royal Mint capsule for a presentation purpose.
Are there situations where raw is better?
Yes. 1) Common-date circulating coins: nobody will pay slab premium for a 1971 BU 50p. 2) Coins you intend to use in albums: you can't put a slab in a Lighthouse 50p album. 3) Royal Mint sets you intend to keep complete: the original packaging is part of the value; slabbing a single coin from a set breaks the set. 4) Coins below £200 sold on eBay UK: raw with quality photos performs as well as slabbed at lower acquisition cost.
How long does grading take?
CGS UK: 2-6 weeks (UK-domestic, no international shipping). PCGS: 3-12 weeks depending on service tier (Express vs Economy). NGC: similar to PCGS. Submissions typically go via UK BNTA-affiliated dealers (who batch-submit weekly to the US for PCGS / NGC). Costs include the slab fee plus return-shipping insurance — budget £30-£90 total per coin including everything.
Will a slab grade ever go up if I resubmit?
Sometimes. Coins are graded by humans and small variations between graders happen; a coin marked MS-63 by one grader may come back MS-64 from another. PCGS / NGC offer paid “regrade” or “crossover” services where you submit a slabbed coin hoping for a higher grade. Realistic expectation: 1 in 10 resubmissions actually upgrades; 9 in 10 come back the same or lower. Worth doing only on borderline coins where one grade-tier increase is worth £500+.
Do graded coins really keep their condition forever?
Practically yes. The slab is engineered for archival storage — UV-resistant plastic, tamper-evident seal, no PVC or other harmful plasticisers. Coins inside slabs remain in the condition they were submitted in for decades. Outside the slab, copper coins can develop natural toning, silver can fog, gold is stable but can scratch. The slab is essentially a 30+ year preservation case.
Is the slab grade the final word on value?
Mostly — PCGS / NGC / CGS UK grades are accepted by every UK auction house and most dealers. But two coins of the same slab grade can still sell for different prices if one has “eye appeal” (centred strike, original toning, no distracting marks). For highest-tier coins, an MS-65 with strong eye appeal can sell for 30-50% more than another MS-65 of the same coin with weaker presentation.
Related guides
- How to get a coin graded — the submission process
- PCGS vs NGC vs CGS UK — service comparison
- How to grade a coin yourself
- Albums vs capsules vs slabs — storage decision