Proof coin auctions: Royal Mint and world proof sets, searched at once

Proof coins are struck using specially polished dies and blanks for a sharper, mirror-like finish than ordinary circulation coins, issued for collectors rather than everyday spending. Royal Mint annual proof sets, commemorative proof £5 and £2 coins, and silver or gold proof strikes of classic designs are among the most consistently collected areas of modern numismatics.

Why proof coin lots get missed

Proof sets are often sold without their original case or certificate, or described vaguely as "coin set" by a seller who doesn't know the difference between a proof and a standard bullion or circulation strike, so a genuinely desirable set can be priced as if it were an ordinary one.

One search across every platform: including a numismatic specialist

Auction Bid Assistant's free browser extension searches the-saleroom, EasyLive, Bidspotter, Invaluable, NumisBids, iCollector and LiveAuctionWorld simultaneously, alongside eBay. NumisBids is itself a platform dedicated entirely to coin and banknote auctions worldwide, so a single search here already reaches specialist numismatic sales as well as the general auction houses where mis-catalogued lots hide. Search a year, a denomination, "Royal Mint proof set," or "proof coin" generally and results return across all of them, with images, estimates, current bids where shown, and sale countdowns, sorted by platform in tabs.

Real results for "proof coin": genuine Royal Mint proof sets and silver proof £5 coins, found in one search.

It works by searching from inside your own browser, the same as opening and searching each site yourself, just done in seconds. Nothing is stored on our servers, permissions are minimal, and the extension never places a bid on your behalf.

Alerts: for the sets and years you collect

Save a search (a year, a denomination, or "proof coin" generally) and get emailed the moment a new lot matches it, across all covered platforms including eBay and NumisBids, rather than relying on remembering to check each one.

Want to try before installing?

The same search box works on this website with no install at all for eBay, iCollector, LiveAuctionWorld and Featured Auction catalogues, a quick way to see matching proof coin lots before adding the rest of the platforms via the extension.

Built for how proof coin collectors actually work

Save any lot with one click from search results, export your shortlist as a printable PDF or CSV before a sale, and on the day itself the optional live bridge feeds the auctioneer's asking price into the free bid calculator, so your maximum (with buyer's premium and VAT included) is always in front of you.

Common questions