How to Spot Rare Errors on Roll Call Manchester NH Coin Show Fri and Say
April 4, 2026Grading Breakdown: Mastering the Art of Coin Evaluation at Manchester NH Shows
April 4, 2026
The Counterfeit Crisis in Modern Coin Collecting
With counterfeits flooding the market, knowing the specific diagnostic points for this item is critical. The Manchester NH Coin Show, while a treasure trove for collectors, has unfortunately become a hunting ground for sophisticated counterfeiters. As regional shows like this one attract both serious collectors and opportunistic scammers, authentication knowledge has never been more essential.
Understanding the Threat Landscape
The Manchester NH Coin Show, held at the Radisson Hotel, has gained significant reputation among New England collectors. Dealer setup typically occurs on Thursday, bringing numerous new faces to the numismatic community. However, this influx of vendors also creates opportunities for counterfeit coins to enter circulation.
Common Counterfeit Types Found at Regional Shows
Based on reports from experienced collectors who frequent the Manchester show, several counterfeit types have been identified:
- Modern Chinese counterfeits of key date coins
- Altered date coins passed off as rare varieties
- Cast copies of colonial and early American coins
- Gold-plated tungsten fakes targeting precious metal investors
Weight Verification: Your First Line of Defense
Weight is perhaps the most reliable initial test for authentication. Every genuine coin has a specific weight range based on its composition and intended specifications.
Standard Weight Specifications
For common U.S. coins typically found at the Manchester show:
Morgan Silver Dollars: 26.73 grams (+/- 0.097 grams tolerance)
Peace Dollars: 26.73 grams (+/- 0.097 grams tolerance)
Walking Liberty Half Dollars: 12.50 grams (+/- 0.088 grams tolerance)
Mercury Dimes: 2.50 grams (+/- 0.065 grams tolerance)
Invest in a precision digital scale that measures to at least 0.01 grams. Any coin falling outside the acceptable tolerance range should be immediately suspect and require further testing.
Magnetic Properties Testing
Magnetic testing provides quick insight into a coin’s composition. Most genuine U.S. coins are non-magnetic, with specific exceptions.
Magnetic Response Guide
Genuine coins that should NOT be magnetic:
- Silver coins (90% and 40% silver compositions)
- Copper coins (large cents through wheat pennies)
- Gold coins
Genuine coins that SHOULD be slightly magnetic:
- 1943 steel cents (strongly magnetic)
- 1943 copper cents (non-magnetic – extremely rare and valuable)
- Modern copper-plated zinc cents (weakly magnetic)
- War nickels (35% silver, slightly magnetic due to copper content)
Die Markers and Diagnostic Points
Die markers are unique characteristics created during the minting process that can help authenticate specific coin varieties. These include:
Types of Die Markers
Die Cracks: Raised lines appearing on the coin surface where the die has deteriorated. Each crack pattern is unique to a specific die marriage.
Repunched Mint Marks: Visible doubling or tripling of the mint mark, indicating it was punched into the die multiple times.
Die Chips: Small raised areas on the coin surface where pieces of the die have broken away.
Die Polish Lines: Fine parallel lines created when dies are polished to remove imperfections.
Key Diagnostic Points for Popular Varieties
1909-S VDB Lincoln Cent: Look for the clear separation between the VDB and the rim, with the bottom of the B aligning with the denticles.
1916-D Mercury Dime: The mint mark should be sharply defined, with the left foot of the D close to the olive branch, and the right foot clearly separated from the wreath.
1932-D Washington Quarter: The mint mark should be positioned between the right side of the tail feathers and the wreath, with specific die characteristics unique to the Denver mint’s dies that year.
Advanced Testing Methods
While weight and magnetic testing provide initial screening, advanced collectors should employ additional verification methods.
Specific Gravity Testing
This method determines a coin’s density by measuring its weight in air versus water. Each metal alloy has a unique specific gravity signature:
90% Silver: 10.3-10.5 g/cm³
40% Silver: 8.6-8.8 g/cm³
Copper: 8.8-8.95 g/cm³
Gold (pre-1933): 17.3-17.7 g/cm³
Microscopic Examination
A quality jeweler’s loupe (10x-30x magnification) reveals surface characteristics invisible to the naked eye:
- Die flow lines radiating from the coin’s high points
- Metal flow patterns indicating genuine striking
- Surface porosity suggesting casting methods
- Tool marks from alteration attempts
Digital Imaging and Comparison
High-resolution photographs compared against known genuine examples can reveal subtle differences in design details, relief height, and surface texture.
Common Counterfeit Techniques and How to Detect Them
Cast Counterfeits
Cast fakes often show porosity, lack of sharp detail, and rounded design elements. They may also exhibit a “soapy” surface texture under magnification.
Transfer Die Fakes
These sophisticated counterfeits use genuine coins to create dies. Look for slight shrinkage (1-2%) and loss of fine detail compared to known genuine examples.
Altered Date Coins
Examine date digits under magnification for signs of tooling, such as metal flow inconsistencies, mismatched font styles, or evidence of grinding and re-engraving.
Gold Plated Fakes
Scratch testing in an inconspicuous area (edge) can reveal plated surfaces. Gold-plated tungsten will still be magnetic, while gold-plated lead will show different specific gravity.
Professional Authentication Services
For high-value coins or when in doubt, professional authentication provides certainty. Services mentioned by collectors at the Manchester show include:
ANACS (mentioned by Sean Reynolds as a service he uses for submissions)
PCGS (Professional Coin Grading Service)
NGC (Numismatic Guaranty Corporation)
ICG (Independent Coin Graders)
These services employ multiple experts and advanced technology to authenticate coins, providing both authentication and grading services with guarantees.
Practical Tips for Manchester NH Coin Show Attendees
Pre-Show Preparation
Research the dealers attending the show. The Manchester show has gained reputation as one of New England’s best regional shows, alongside the NENA show in Milford, MA. However, this reputation also attracts sophisticated counterfeiters.
During the Show
Bring your testing equipment: precision scale, magnet, loupe, and reference materials. The show offers no sales tax, making it attractive for purchases, but this also means buyers must be extra vigilant about authentication.
Post-Purchase Verification
Even after careful in-person examination, consider submitting significant purchases for professional authentication. The investment in authentication services is minimal compared to the potential loss from a counterfeit coin.
Conclusion: The Collector’s Responsibility
The Manchester NH Coin Show represents an excellent opportunity for collectors to acquire quality coins, network with dealers, and expand their collections. However, with this opportunity comes the responsibility to educate oneself about authentication techniques.
By mastering weight verification, magnetic testing, die marker identification, and advanced testing methods, collectors can protect themselves from the growing counterfeit threat. Remember that authentication is not just about avoiding losses—it’s about preserving the integrity of the numismatic hobby and ensuring that genuine numismatic treasures are properly recognized and valued.
The knowledge shared by experienced collectors like those who attend the Manchester show is invaluable. As one collector noted, making it to these regional shows provides access to coins and expertise that might otherwise be unavailable. Take advantage of this community knowledge while developing your own authentication skills.
Whether you’re attending the upcoming winter show (now scheduled for early December) or planning for future events, approach each potential purchase with a critical eye and the authentication knowledge to back it up. Your collection—and your investment—will thank you.
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