Kindly read our FAQs ("Tutorials") before submitting appraisals or inquiries!


We are the only N.Y. traveling dealer with A.N.A. Life Membership, U.S.P.A.P. Ethics, and I.R.S. standards.


Family-friendly appraisals, complimentary for small collections. SHIP INSURED FOR AN OFFER!


Kindly read our FAQs ("Tutorials") before submitting appraisals or inquiries!


We are the only N.Y. traveling dealer with A.N.A. Life Membership, U.S.P.A.P. Ethics, and I.R.S. standards.


Family-friendly appraisals, complimentary for small collections. SHIP INSURED FOR AN OFFER!


Call Today  •  (914) 649-3317  •  (833) THE-COIN  •  (833) 843-2646

ABOUT US

We buy and sell coins among many other items. Our USPAP appraisals are backed with thirty years of numismatic experience. We work with coin collectors, dealers, auction houses, historical societies, and educational institutions.

MEET THE TEAM

We specialize in coins, currency, collectibles, jewelry, antiques fine art and more. We work with common and rare metals, and all types of coins including US Coins, foreign currency, ancient coins, mint and proof sets.

Marc Alan Rosner

Marc Alan Rosner
A Lifetime of Learning

A passion for coins, currency, safes and locks, and helping people 

I hold a B.A. in Historical Archaeology from Wesleyan University, and an M.A. in Science Education from Columbia University. I have over 30 years of experience collecting and dealing in rare items and enjoy meeting people and hearing stories about the things that they have. I publish and write articles and books on science and numismatic education.

In June 2024 I retired from teaching high school and middle school science and am fortunate to now be a full-time numismatist. I started Hudson Valley Numismatics over 20 years ago when someone sought me out about selling their collection and I realized I could turn my hobby and passion into a business. 

Read: Building a U.S. Style Collection

Diane Gross

Diane Gross
A Lifetime of Learning

New to numismatics but not small business 

With a B.A. in Health and Society from the University of Rochester and a Master in Public Health from Columbia University, what am I doing in the coin and estate business? After a 30-year career, I was incentivized to make some changes. Marc and I met in 2018 and married in 2024. We both were at pivotal points in our day jobs and have decided to expand our partnership to business and work full-time helping people with their estates. We are now a family business. 

With previous small business experience and years of working in the non-profit space doing a bit of everything, I am working on social media, website content, operations, auctions, business development, marketing, and learning. 

Mary Griffiths

Mary Griffiths
A Lifetime of Learning

History Buff

I consider myself both a historian and educator. History has been my main passion. I have a B.A and M.A. in American History, with concentrations in the American Civil War, Prohibition, Eisenhower and the Cold War, and thanatology (the study of death). I gossip about dead people, take people to their homes and graves, then rearrange all their stuff. (Historian, tour guide, archivist). When dealing with the living, I answer the questions others are afraid to ask and educate the public on a topic with which they are unfamiliar.

We want democracy to survive for all generations to come, not to become the insolvent phantom of tomorrow. Eisenhower Farewell Address, 1961


Andrei Bobkoff

Andrei Bobkoff
A Lifetime of Learning

A Global Perspective

I was born in Belarus and achieved both a Bachelor's degree in English from Minsk State Linguistic University and Associate's degree in Business Administration from the Borough of Manhattan Community College. I am also a graduate of the American Numismatic Association's Seminar series, where we complete annual coursework in coin authentication, grading, valuation, and sales. I speak English and Russian fluently, which helps bridge the gap between U.S. communities and abroad. I recently became an American citizen and have worked with Marc since I came to the U.S. nearly 20 years ago. I run Honest Coin Shop in NJ and collaborate with Hudson Valley Numismatics.  

Education Image

We Proudly Support Local Youth and Education

We are proud to have had the honor of donating goods and services to the following institutions and charities: The Hastings Historical Society, the Dobbs Ferry Historical Society, the Tarrytown Historical Society, the Hastings Education Foundation, the Ardsley Education Foundation, and the Village of Hastings-on-Hudson Recreation Department.

Rare Coin and Currency Consulting

We identify items, determine value, and even make an offer on the spot. We can help you decide what to sell, put at auction, or hold for investment.

Or call us now to discuss your items
(914) 649-3317 (833) THE-COIN (833) 843-2646

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