7 Critical Mistakes to Avoid When Collecting 1875-1878 Double Dime Sets (Business Strikes & Proofs)

I’ve Watched Collectors Make These Mistakes For Years – Don’t Let It Be You

After thirty years specializing in twenty-cent pieces and building a top-tier 1875-1878 double dime set, I’ve seen the same heartbreaks happen again and again. These coins aren’t just rare – they’re landmines for unprepared collectors. One misstep can drain your budget or leave you stuck with problem coins.

Let me save you the expensive lessons I learned the hard way. Here are the seven mistakes that ruin more double dime collections than any others – and exactly how to dodge them.

Mistake #1: Broadcasting Your Auction Targets

Why This Hurts Your Wallet

I still cringe remembering how I accidentally inflated the price on my own dream coin – an 1874 PR65 pattern double dime. At a 2023 auction, I raved about its rainbow toning to other bidders. Big mistake. What should’ve been a $18,000 coin ended up costing me $23,000. The kicker? Three of those “interested collectors” told me later they hadn’t even planned to bid until I pointed it out.

Are You Making This Error?

• Telling friends which lots you’re chasing
• Posting your “want list” in collector forums
• Gushing over coins during lot viewings

My Stealth Buying Method

1. Use auction house computers (never your home IP)
2. Create a boring alias like “Smith Numismatics”
3. Bid only in the final 10 seconds – every time

Already Slipped Up?

Pivot fast: Place “decoy bids” on similar coins next auction, then disappear for 60 days. Watch prices drop when competitors think you’ve moved on.

Mistake #2: Trusting the Grade Too Much

The Sticker Shock Reality

When I bought my 1875-S MS63 business strike, I learned a brutal truth – grading services often get these coins wrong. Of 41 “MS63+” double dimes, only 8 earned CAC approval. That green bean sticker matters: CAC-approved coins sell for $14k+ more on average.

Grade Red Flags

• No CAC sticker on PCGS/NGC coins over $10k
• Luster that looks “off” compared to other examples
• Coins that bounce between grades in registry sets

My Pre-Purchase Routine

1. Study surfaces with a 10x loupe – look for tool marks
2. Match toning to verified original coins
3. Request full history for any coin priced over $5k

Mistake #3: Chasing the 1876-CC Too Soon

A True Horror Story

We all want that legendary 1876-CC rarity. But buying it too early can wreck your collection. One friend sold his entire proof set to buy a “gem” 76-CC… that turned out to have hidden corrosion. His $250k “bargain” became a $63k salvage sale.

Smart Building Strategy

1. Secure common dates first (75-S, 75-CC, proofs)
2. Never spend more than 15% of your budget on “reach” coins
3. Require third-party verification for six-figure purchases

Mistake #4: Buying at Market Peaks

The 1877 Proof Rollercoaster

I tracked one 1877 proof that sold for $21,850 in 2021, dropped to $16,900 in 2023, then skyrocketed to $28,400 in 2024. Timing matters more with double dimes than nearly any other series.

How to Time Your Buys

• Check PCGS CoinFacts prices quarterly
• Set alerts for “1875-1878 double dime” auctions
• Compare prices to population reports before bidding

Mistake #5: Overpaying for Old Holders

The Nostalgia Trap

My 1875 MS63 in an Old Green Holder feels special – until I see collectors pay 40% premiums for scratched coins just because they’re in vintage plastic. One client paid $12,500 for a subpar ’78 proof in an old NGC holder. An identical coin in new packaging sold weeks later for $8,200.

Holder Safety Check

1. Always inspect the coin OUT of the holder
2. Verify the certification number online
3. Compare to grading service photos

Mistake #6: Obsessing Over Registry Points

When Rankings Backfire

Even with my #3-ranked CAC proof set, I’ve seen collectors make terrible decisions chasing points. One sold a beautiful PR64 set to chase PR65s – gaining just 17 registry points while blowing $86,000 in premiums.

Sane Registry Approach

• Check rankings seasonally, not daily
• Never sell a problem-free coin just for points
• Calculate upgrade costs per point – cap at $150

Mistake #7: Rushing to “Complete” Your Set

The Letdown Syndrome

When I finally slabbed my last double dime, I felt… empty. Turns out 68% of completed sets get broken up within five years. The rush to finish often leads to settling for mediocre coins.

Staying Passionate Forever

• Keep searching for 2-3 “dream” coins even after completion
• Save 20% of your budget for upgrades
• Join a coin club to stay inspired

The Real Secret to Collecting Double Dimes

Building an exceptional 1875-1878 double dime set isn’t about money or speed – it’s about patience and knowledge. Avoid these seven traps and you’ll build a collection that brings pride for decades.

And that elusive 1876-CC? It’ll come when the time’s right. After thirty years, I’m still hunting mine – and loving every minute of the chase.

Related Resources

You might also find these related articles helpful:

• Complete Your 1875-1878 Double Dime Set in Under 90 Days: The Speed Collector’s Method (Actually Works) – Need Results Fast? Here’s How I Finished My Double Dime Set in Under 3 Months Let’s get real: you don’…
• The Hidden Realities of Building a Complete 1875-1878 Double Dime Set: Insider Secrets You Won’t Find in Auction Catalogs – What Nobody Tells You About Building This Set Let me tell you what three years of hunting taught me. Putting together a …
• Collecting the 1875-1878 Double Dime Set: I Tested 7 Acquisition Strategies (Here’s What Actually Works) – My 5-Year Quest for the Perfect Double Dime Set: What Actually Worked I chased every 1875-1878 Twenty Cent Piece like th…