Coin and Paper Money Collecting/Expert Profile

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Please, no error coin questions unless your coin is dated 1955 or before. I can answer questions regarding all U.S. Coins, Gold & Silver bullion, including regular mint and proof issue coins and currency. Since 2009, I have been contributing to the Red Book, "A Guide Book of United States Coins", by R.S. Yeoman along with two other publications. I currently run two coin shops in California.

Experience in the area

I have over 30 years experience in Numismatics. I own two coin shops and have examined thousands of coins over the years. Please allow up to 2 business days for an answer. This is a free service and I am happy to answer questions - but please be patient and understanding of my time.


My company is an authorized P.C.G.S. and N.G.C. dealer. I am a Life Member of the American Numismatic Association and California State Numismatic Association. We are also an authorized Whites Metal Detector dealership.


I have written articles for Coin World and the Rare Coin Market Report.


I have a certificate of completion from the American Numismatic Association on how to detect counterfeit U.S. Gold Coins and how to Grade U.S. Coins along with other certifications. I have a Bachelor of Science in Business with a concentration in Accounting and a minor in Computer Information Systems.

Awards and Honors

I am listed as a contributor to the Red Book, "A Guide Book of United States Coins", the Red Book, by R.S. Yeoman. I have been contributing to the Red Book since 2009. I also contribute to the Blue Book and the new Professional edition Red Book. I have many other awards and honors.

Past/Present Clients

My past consulting clients included eBay, Inc., Yahoo! Auctions, and the United States Postal Service. I have many other great customers and help all no matter their level of collecting.

What do you like about this subject?

I have a real passion for coins and enjoy maximizing value for customers on both the buying and selling side of a transaction.

What do you still hope to achieve/learn in this field?

My company continues to grow and we have always had the vision to be the largest Numismatic organization in the world. To do this we maintain a high standard of competitiveness and value to our customers.

Something interesting about this subject that others may not know:

There is a lot of history that correlates directly with the designs of many coins. Get into coins and you will learn about history and own something that will last forever.

Something controversial or provocative about this subject

SAVE YOUR NICKELS! A $100 box of Nickels is worth over face value. In order to stop people from melting these coins it is currently against the law to export or melt Nickels!!

Average Ratings

Recent Reviews from Users

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
Jerry Hatfirld05/09/151010Although I still do not know the .....
Tiffany03/19/15101010Thank you so much for your help .....
Richard Stone02/14/15101010Thank you for the Quick response. The .....
otto07/16/14101010Thank you very much !

Recent Answers from Troy Thoreson

2015-03-18 2000 S quarter:

Hi Tiffany,      Great job on the question and pictures.  Yes, this quarter was once part of a proof set.  And it appears to be the clad version.  In the year 2000 Proof (S) Quarters were made both Clad

2015-02-08 old half dollars:

Hi Richard, We see these types of coins many times in a month.  Today, we are buying for $6 each and selling for $7.5 for typical circulated (1949/1964) examples.  The margins narrow as people sometimes

2014-07-16 gold pattern:

I am not aware of a pattern for this year and Mint Mark.  I believe this is a modern reproduction.  You may want to check the weight, a normal coin for this year and mint should have a weight of 33.4 grams

2014-06-23 Eisenhower Dollar 1776-1976:

Nothing wrong with wishful thinking.  The Eisenhower Dollar was made at San Fran - "S" Mint - special collector coins only, Denver - "D" Mint, and Philadelphia - no mint mark.  You have the thick/thin

2013-11-18 50 cent silver halfs:

Hi Stephen,    Kennedy Half Dollars are split into three groups with different silver compositions, 90% Silver, 40% Silver, and Clad (Copper/Nickel).   Weights given are for uncirculated or proof coins


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