Auckland’s Coin & Banknote Dealership

About Aventine

Aventine is a New Zealand firm originally founded as a private venture by a group of collectors and investors trading in coins and precious metals.

We buy, sell, and auction rare coins, banknotes, historical medals and bullion, and act for collectors, estates, investors and institutions across New Zealand. We are an Authorized Dealer in Coins and Banknotes by NGC and PMG, the appointed New Zealand agent for Spink & Son of London, and a member of the New Zealand Numismatic Dealers Association.

Our History

1. 2015

   Founded in Auckland

   Our New Zealand branch was first established in Auckland.

2. 2021

   NGC and PMG appointment

   Aventine received its first international appointment, as an Authorized Dealer with NGC (Numismatic Guaranty Company) and PMG (Paper Money Guaranty), the two most widely recognised third-party numismatic authorities in the world.

3. 2021

   The 1879 Bank of New Zealand £100 note

   Aventine acquired the 1879 Bank of New Zealand £100 note, which held the record price for a New Zealand banknote at $85,000 AUD. The acquisition was covered by the New Zealand Herald.

4. 2024

   Appointed New Zealand agent for Spink & Son

   Our specialist Joshua Lee was appointed as the official New Zealand Numismatic Agent for Spink & Son, the London auction house established in 1666. Spink’s connection to numismatics in New Zealand reaches as far back to 1897, when the Spink Diamond Jubilee Medal Series for New Zealand was issued to mark the sixtieth year of Queen Victoria’s reign.

5. 2024

   A Record Coin Sale for New Zealand: $130,000+ NZD

   Aventine sold an 1894 German New Guinea Gold 20 Mark for the equivalent of 67,500 EUR to a private collector in New Zealand.

6. 2025

   Repatriation of the first RBNZ-issued banknote

   Aventine acquired and returned to New Zealand the first banknote issued by the Reserve Bank of New Zealand, formally ex Aventine FPO No. 1 ( $105,000 NZD ).

7. 2025

   First North Island Cook Resolution and Adventure Medal

   Aventine was the first specialist to assess a 1772 Captain Cook Second Voyage Resolution and Adventure Medal unearthed in Wellington — the first recorded discovery of the type in the North Island.

8. 2025

   The Official Sale Host of the ANE Auction

   Since 2025, we have been appointed the sole Sale Host for the Auckland Numismatic Expo event auction, New Zealand’s largest annual public coins and banknotes event.

9. 2026

   C&B Auctions established

   Our Christchurch department was re-established as C&B Auctions, bringing a unique to the New Zealand auction market: 0% Buyer’s Premium, no GST surcharge, and $1 start bids.

10. 2026

    Katalognator AI Software

    We developed Katalognator, an experimental AI software for numismatics developed in-house and trained on the combined knowledge of our numismatic specialists and consultants.

What We Do

• Buying & Outright Purchase Single items through to whole collections and estates.
• Retail & Private Sales New Zealand and world coins, banknotes, medals and bullion.
• Public Auctions Monthly sales through C&B Auctions.
• Grading Submissions Official NGC and PMG submission services for New Zealand.
• International Consignment Global Consignments to Spink & Son London, Hong Kong, and USA.
• Written Valuations Insurance, probate, estate division and family settlement.
• Estate & Executor Services Assessment, cataloguing and realisation of holdings.
• Precious Metal Verification Sigma Metalytics PMV Distributor and XRF metallurgical research

Locations

• Auckland — Public Office 31 Bartley Terrace, Devonport, Auckland 0624
  Level 1, Unit D, Suite E
• Christchurch — C&B Auctions Our auction department, operating monthly public auctions.
  By appointment.
• Wellington Satellite branch.
  By appointment.

For substantial collections and high-value single items, our specialists can arrange to travel elsewhere within New Zealand.

Accreditations, Registrations & Memberships

• NGC Authorised Dealer Numismatic Guaranty Company · Dealer 5192 · Since 2021
• PMG Authorised Dealer Paper Money Guaranty · Dealer 5192 · Since 2021
• Spink & Son New Zealand Agent Appointed 2024 · Spink & Son, London, Established 1666
• NZ Numismatic Dealers Association
• Licensed Secondhand Dealer in New Zealand
• Sigma Metalytics Authorised Distributor
• HW Wood Specialist insurance cover for coins, banknotes and precious metals
• NZBN & GST Registered