Error banknote auctions: genuine printing errors, searched at once

Genuine printing errors, mismatched serial prefixes, a missing signature, an off-register print, or a smeared ink error, slipped past quality control before reaching circulation, and a verified error note can be worth many multiples of a normal example. Because they're accidents rather than a planned issue, they can turn up in any country's currency, on any platform, without warning.

Why error notes get missed

A genuine error is easy to mistake for a damaged or worthless note if you don't know what you're looking at, and sellers who do spot one often list it in a specialist numismatic sale, while others simply describe a general banknote lot with no mention of the fault at all. Both routes mean the same search has to cover general and specialist sales at once.

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 "error note," "mismatched prefix," "missing signature," "ink error" or a specific denomination 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 "error note": genuine misprints including a mismatched-prefix £1 note and a missing-signature £5 note, 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: the single most useful feature for error notes

Because a genuine error might only ever be listed once, save a search ("error note," a specific fault type, or a denomination) 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 error note lots before adding the rest of the platforms via the extension.

Built for how error note 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