Editor’s Note
Heritage Auctions Japan will host preview events in Osaka and Tokyo this October, offering a first look at rare coins, jewelry, watches, and handbags set for auction in late 2025 and early 2026.
Heritage Auctions Japan (headquartered in Texas, USA) will hold preview events for rare coin and luxury auctions at The Westin Osaka on October 3rd (Friday) and 4th (Saturday), 2025, and at Andaz Tokyo on October 7th (Tuesday), 2025.
The events will showcase notable items from upcoming coin, jewelry, watch, and handbag auctions scheduled from November 2025 to January 2026. Attendees can view actual items, including additional antique coins from Japan and the UK from the “P Family Collection” and “Eternal Collection,” which garnered attention at the summer coin auctions, as well as rare pink diamonds.
Concurrently, the venue will host free appraisal sessions for coins and jewelry by experts. Those wishing to consign items can initiate the process and hand over items on-site.
This time, Chris Bierrenbach, an executive from the Coin Department, and Kyle Johnson, the newly appointed Director of the World & Ancient Coins Department, will travel from the US headquarters to Japan. They will conduct gallery talks introducing the exhibits and mini-lectures for coin beginners. Everyone is welcome to participate.
Heritage Auctions was founded in 1976 by coin collectors Steve Ivy and Jim Halperin and has handled rare coins for over 45 years. As a result, it has established itself as the world’s largest auction house in the rare coin sector. Coins consigned from collectors worldwide, including the US, are often highly rare, and their value has further increased recently against the backdrop of rising gold prices. Collector items, led by coins, are attracting increasing attention year by year. In the first half of 2025, many items sold at Heritage Auctions achieved high hammer prices, significantly contributing to the company’s record-high total sales for a first half.
During the preview and appraisal event period, the company’s experts will conduct free appraisals for coins and jewelry, providing guidance on valuation in the global market and auction procedures. Those wishing to consign items can hand them over on-site. Consultations regarding auction consignment, bidding, and collection building are also available.
Osaka Venue
・Dates/Times: October 3rd (Fri) & 4th (Sat), 2025, 10:00 AM – 7:00 PM
Gallery Talks: October 3rd (Fri) 3:00 PM & 6:00 PM; October 4th (Sat) 3:00 PM
・Venue: The Westin Osaka, 7F “Pariusta”
1-1-20 Oyodonaka, Kita-ku, Osaka City 531-0076 Tel: 06-6440-1003
・Admission: Free *Advance reservation is required for participation.
Tokyo Venue
・Date/Time: October 7th (Tue), 2025, 10:00 AM – 7:00 PM
Preview & Appraisal: 10:00 AM – 5:00 PM
Reception & Gallery Talk: 5:00 PM – 7:00 PM
・Venue: Andaz Tokyo, 51F Chef’s Studio / Gallery
1-23-4 Toranomon, Minato-ku, Tokyo 105-0001 (Toranomon Hills Mori Tower) Tel: 03-6830-1234
・Admission: Free *Advance reservation is required for participation.
Chris Bierrenbach
Began trading coins in his hometown of Rio de Janeiro at age 7, eventually establishing his own coin business. At 30, he became the youngest Technical Director of the Brazilian Numismatic Society. After joining Heritage in 2007, he significantly expanded sales for the World & Ancient Coins department and became a partner in 2011. He developed Heritage’s online-only auction platform, which has grown to host over 60 auctions annually with sales exceeding $12 million. Since 2015, he has led international expansion in Europe and Asia, supporting Heritage’s global growth.
Kyle Johnson
Kyle has cultivated a unique perspective that blends his passion for design with an interest in numismatics, connecting the artistry of coins with their historical and cultural significance. He began his career in the auction industry over a decade ago, initially handling fine and decorative arts on the US East Coast. His hobby of coin collecting later evolved into deeper research exploring how coin design reflects societal values and history. He is currently part of Heritage Auctions’ World & Ancient Coins department and was appointed its Director in 2025.
Tomoko Mizutani
After joining Sotheby’s Japan in 2006, she contributed to establishing and expanding the Jewelry & Watch department. From 2016, she worked as a Jewelry Specialist at Phillips, handling high-net-worth clients and strengthening the company’s presence in the Asian market. In 2024, she promoted Japanese operations as a Partner Agent for Anticorum Geneva while also handling sales of luxury goods at an international consulting firm. Since 2025, she has been active as Consignment Director at Heritage Auctions Japan, focusing on the Luxury department. She is a GIA Graduate Gemologist and holds a Master’s degree in Art History from the University of Glasgow.
Free Appraisal Categories: Coins / Jewelry
*Appraisals based on images are also available for those unable to attend.
*For other categories such as watches and handbags, please inquire.
Reservation Application:
To participate in the preview or gallery talks, please email your name and expected number of attendees by September 30th (Tuesday). Email: [email protected]
For free appraisals, please make a prior reservation. Email your preferred date/time and a summary of the items you will bring to the above address. On-site registration is possible but may involve waiting during busy periods.
1817 George III “Three Graces” Crown Silver Proof Pattern Coin NGC PR63+
From the “Eternal Collection”
Estimated Price: $120,000+ (approx. ¥17.6 million)
Macedonian Kingdom Alexander III the Great (336-323 BC) AV Distater NGC XF
Estimated Price: $50,000+ (approx. ¥7.4 million)
Fancy Pink Diamond Ring
6.17 carats, VVS2 clarity
Estimated Price: $1,200,000 – $1,800,000 (approx. ¥176 million – ¥265 million)
